THE
HOOVER DAM
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BUILDING AMERICA: THEN AND NOW
The Alaska Highway
The Brooklyn Bridge
The Eisenhower Interstate System
The Empire State Building
The Hoover Dam
The New York City Subway System
New York City’s Central Park
The Telephone: Wiring America
THE
HOOVER DAMREBECCA ALDRIDGE
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The Hoover Dam
Copyright © 2009 by Infobase Publishing
All rights reserved. No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage or retrieval systems, without permission in writing from the publisher. For information contact:
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Library of Congress Cataloging-in-Publication DataAldridge, Rebecca. The Hoover Dam / by Rebecca Aldridge. p. cm.—(Building America : then and now) Includes bibliographical references and index. ISBN 978-1-60413-069-0 (hardcover) 1. Hoover Dam (Ariz. and Nev.)—Juvenile literature. 2. Dams—Design and construction—Juvenile literature. 3. Water-supply—Southwest, New—Juvenile literature. I. Title. II. Series.TC557.5.H6A43 2009627'.820979313—dc22 2008025545
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IntroductIon The Dry West 7
chapter1 Before Hoover Dam 11
chapter2 Arthur Powell Davis’s Great Idea 25
chapter3 From Idea to Approved Project 37
chapter4 The People Who Built Hoover Dam 51
chapter5 Construction Begins 66
chapter6 Dams in the World Today 86
Chronology and Timeline 98
Glossary 102
Bibliography 103
Further Resources 109
Picture Credits 111
Index 112
About the Author 119
Contents
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7
T he time was the early 1930s, the president was Herbert
Hoover, and the situation in the United States looked bleak.
The stock market had crashed in 1929, and most Americans were
hurt by the Great Depression, which left a majority of them job-
less, homeless, and penniless. But in the West, a beacon of hope
was in the works— a major structure that would symbolize the
nation’s technological prowess. That structure, built as graceful
as it was strong, would come to be known as the Hoover Dam.
In the dry western United States, water resources and water
rights had almost always been an issue. For this growing area of
the country, water for drinking and irrigating land was an ever-
increasing necessity. The United States Reclamation Service was
formed to help deal with these concerns. This government entity
and its engineers would come to play a great part in the construc-
tion of the Hoover Dam.
When early settlers arrived in the West, they could hardly
have been able to imagine that any structure could control the
Colorado River and its strong- minded fl ow. Yet a man named
INTRODUCTION
The Dry West
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the hoover dam�
The Hoover Dam (above) was built to provide the western United
States with water. Although it was a dangerous and risky venture,
the construction project created jobs for thousands of unem-
ployed men during the Great Depression. Located on the Colo-
rado River, this ambitious feat of engineering is one of the largest
hydroelectric projects in the history of the United States.
9
Arthur Powell Davis dreamed an amazing dream for the area of
the Colorado Basin. Davis’s dream certainly did not become a
reality overnight. For a project of this magnitude to succeed, fi eld
investigations would have to be conducted, politicians would
have to organize, seven western states that had been arguing
for years would have to make a fi nal and lasting negotiation on
water rights, and a company that could actually bring to life such
an enormous entity would have to be found. It took years, but
eventually all obstacles were overcome.
Created from a whopping 4.5 million cubic yards (3.4 million
cubic meters) of concrete, the majestic dam was built in the
middle of nowhere, stretching across the mighty Colorado River
in the desolate Black Canyon. To provide for the dam’s construc-
tion, the government would have to lay down rail line, electricity
would have to be connected, and living quarters for thousands
of workers would have to be built. In short, the dam was an
immense undertaking.
The organization in charge of building this one- of- a- kind dam
from the canyon fl oor up was Six Companies— a conglomera-
tion of several businesses and individuals with construction and
engineering experience who could not possibly have done the job
alone. The ones responsible for its actual rise, block by block,
726 feet (221.3 meters) into the air were 5,000 men who came
from all across the country. Most of these men were desperate
to feed themselves and their families in the hungry times of the
Depression. Living and working in extreme conditions, these
workers— some with no previous construction experience—
jackhammered, blasted, dug, and swung hundreds of feet in the
air from the canyon walls, all in the name of progress.
Over the course of several years— from 1931 to 1936—the dam
took shape, a reservoir was created, and a hydroelectric power
plant was built. During this time, the construction claimed 96
lives. In the end, however, this fascinating superstructure— and
the world’s tallest dam at the time— would prove to be a lasting
memorial to the thousands of men who saw it to completion.
The Dry West
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THE HOOVER DAM10
Although the Hoover Dam has since been surpassed in height,
it remains one of the most widely recognized structures in the
world— and a crowning achievement in American engineering.
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D ams— the kind made by humans— date back thousands of
centuries, but beavers are likely the ones to thank for this
development in civil engineering. These hardworking, furry crit-
ters were the fi rst to build dams. Their handiwork may well have
provided the inspiration early humans needed to embark on the
ambitious goal of controlling a river’s fl ow.
DAMS AROUND THE WORLDDam building was an important development in civil engineering
that progressed around the world and through the centuries long
before the Hoover Dam was built. From Egypt to Mesopotamia
to Europe, people discovered that dams could irrigate dry lands,
provide water for drinking, and even create a beautiful lake for
pleasure and recreation.
Egyptian DamsThe world’s earliest dams appeared in lands where the climate was
particularly dry. The single-earliest-known dam was the Egyptian
CHAPTER 1
Before Hoover Dam
11
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THE HOOVER DAM12
12
dam Sadd- el- Kafara, the remains of which were found in 1885 by
German archaeologist George Schweinfurth in Helwan, an area
20 miles (32 kilometers) south of Cairo. He and other experts esti-
mated that the dam, whose name means “Dam of the Pagans,” was
built between 2950 and 2750 B.C. The dam, approximately 350 feet
(106.7 meters) long and 37 feet (11.3 meters) tall, created a fairly
large artifi cial lake, or reservoir. Considering the lack of technol-
ogy available in ancient times, it may be surprising to learn that
100,000 tons (90,719 metric tons) of material were used to create
Sadd- el- Kafara, one of the world’s oldest civil engineering struc-
tures. Built in three sections, the dam’s thickness was 276 feet
(84.1 meters) at the base and 200 feet (61 meters) at its crest, or
highest point. The early Egyptian builders also employed the tech-
nique of covering the sloping side of the dam— which was exposed
to the river’s water— with a limestone coating. This extra step
protected the dam from erosion. As good as all of this may sound,
the dam actually was poorly constructed and not watertight.
The majority of early dams were built to irrigate land, but
experts think the Sadd- el- Kafara was different. Archaeologists
believe its main purpose was to provide drinking water for both
people and animals. Unfortunately, the dam did not serve the peo-
ple of Egypt for long; most likely, a fl ood destroyed it only a few
years after its completion. Experts were aided in this conclusion
by material the dam left behind. Silt collects and builds up in the
reservoir behind a dam. In this case, experts could tell how long
the dam was in use by the amount of silt they found behind it.
The Sadd- el- Kafara Dam was Egypt’s fi rst, and other dams
were not constructed there until eight centuries later. Perhaps
the failure of this early dam discouraged further construction
attempts. Another explanation may be that there simply was no
need for more dams.
Mesopotamian DamsMesopotamia was another site of some of the world’s earliest
dams. Although no physical evidence of dams has ever been
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13Before Hoover Dam
Beavers living around small creeks build dams (above) from sticks, mud, and
stones to create large ponds of water. Their ingenuity most likely helped pro-
vide the inspiration for humans to construct dams for purposes of irrigation,
fl ood prevention, and energy production.
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THE HOOVER DAM14
found in the region, ancient records prove they did exist— mainly
in the many mentions of irrigation. A tablet discovered and dated
around 2140 to 2030 B.C. refers to the wages women earned for
using reeds to make a dam. More proof of the existence of dams
comes from information on King Hammurabi, who ruled in Baby-
lon around 1800 B.C. Hammurabi insisted that his people follow
rules and regulations when it came to operating the numer-
ous dams and canals attached to his many irrigation projects.
According to the book A History of Dams by Norman Smith, Sec-
tion 53 of Hammurabi’s legal code described harsh punishment
for anyone who ignored the king’s law: “If anyone be too lazy to
keep his dam in proper condition, and does not keep it so; if then
the dam breaks and all the fi elds are fl ooded, then shall he in
whose dam the break occurred be sold for money, and the money
shall replace the corn which he has caused to be ruined.”
MAKING AN OLD DAM NEW AGAIN
Alacahoyuk is a town in Turkey with a population of 2,500 people. Since
the early 1900s, archaeologists have been digging near the town to
uncover an ancient royal city. In 2002, a team from a local university
unearthed something unexpected— a 3,246- year- old dam. The dam
was built by the Hittites, who ruled much of the Middle East between
2000 and 1000 B.C. With help from the government, the university team
removed an astounding 88 million cubic feet (2,640,000 cubic meters)
of mud that covered the ancient dam. Even more remarkable than that,
the stone- and- clay dam that served the Hittites all those thousands of
years ago has been brought back to life. Now restored, it serves the
town’s current residents by helping to irrigate their farmland. The reser-
voir holds 1.1 million cubic feet (33,000 cubic meters) of water, and its
original purifying pool makes the water drinkable.
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15Before Hoover Dam
Roman DamsThe Roman Empire was vast, and within its territories—
including parts of North Africa and the Middle East— many
dams were built, some of them remarkably big. Within their own
nation of Italy, however, today’s historians and archaeologists
are aware of only three dams built by the Romans. One of these
dams was built at the direction of Emperor Nero during his rule
(A.D. 54–62). The construction of this gravity dam occurred near
the emperor’s villa in Subiaco, Italy. Not only was it one of the
fi rst dams ancient Romans ever built, it was also the tallest,
reaching a height of 131 feet (40 meters). The dam’s record height
remained unbeaten until 1594, when the people of Spain built
the similarly rectangular- shaped Tibi Dam extending 151 feet
(46 meters) into the sky.
Nero’s desire for a dam was not for the usual irrigation
purposes. Instead, he hoped to create a recreational lake for
his villa. Like the Sadd- el- Kafara, this dam too lacked proper
construction— its rectangular wall was built too thin. Despite its
faulty design, the dam managed to last many hundreds of years
until 1305, and it may have lasted even longer were it not for two
monks. Stories report that a religious duo was responsible for its
failure. The dam’s recreational lake was fl ooding nearby fi elds,
so the two men removed a number of the dam’s stones to lower
the reservoir’s water level and save their land. The Subiaco Dam
is also linked to the oldest known picture of a dam. A monastery
close to the site is the home of a painting from 1428 that depicts
a saint fi shing near the dam.
European Dams and ModernizationAfter the Roman Empire fell, the building of large dams was
rare. Not until shortly after the Middle Ages— when dams were
constructed in Northern Europe— did dam building reemerge.
Dams improved life for Europeans by providing water for vil-
lages, water- powered mills, and canals. One such structure was
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THE HOOVER DAM16
located near Toulouse, France, in a town known as Ferréol.
King Louis XIV approved this earthen embankment dam and its
accompanying canal to maintain the area’s local water supply
during the dry season. Designs for the Saint Ferréol Dam were
drawn up in 1662, and construction began in 1666. Completed
in 1675 and reaching a height of 115 feet (35.1 meters), it was
taller than any other embankment dam in the world. In fact, 165
years went by before another embankment dam surpassed this
height.
The true beginnings of dam modernization in Western civiliza-
tion began in sixteenth- century Spain. The country’s dry climate
and limited water resources made dams a welcome innovation.
The people of Spain constructed gravity dams, curved gravity
dams, and arch dams. The Spaniards not only built these struc-
tures, they also captured on paper their ideas for dam design and
construction. They are credited with the fi rst-known manual that
describes in detail how to build a dam.
The Industrial Revolution of the eighteenth century brought
more dams as cities grew and new industries were developed—
all of which resulted in a greater need for available water.
During this time, in 1736, Don Pedro Bernardo Villa de Berry
made his own contribution to dam development. This Basque
nobleman wrote about the geometrical rules one should follow
when designing a dam. His work led people to use more specifi c
calculations and reasoning in dam building rather than rely on
intuition alone.
More progress occurred in the nineteenth century, when
power tools came into use. With this development, engineers
began to study how to build better structures. During the 1850s,
W.J.M. Rankine— a professor of civil engineering at Glasgow
University in Scotland— was the fi rst to show how science could
be used to alter dam construction, resulting in improved and
stronger designs. Stronger cements and reinforced concrete were
created at this time as well.
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17Before Hoover Dam
DAM TYPESDams come in several shapes and a variety of sizes. Early
embankment dams eventually led to the construction of other
types of dams that could better serve the factors of various set-
tings. All four dam variations take a different approach to how
the dam’s upstream face resists the water’s force. All four have
something in common too: They must be wider at the bottom,
because of the intensity of the water pressure below. The four
types of dams that exist today are embankment dams, gravity
dams, buttress dams, and arch dams.
Embankment DamsThe fi rst dams built were embankment dams. They are the larg-
est dam type. Unlike the three other kinds of dams, which are
made of concrete, embankment dams are made using natural
materials such as earth, clay, sand, and gravel. To build an
embankment dam, the material is piled into one great heap and
heavy machinery— such as large rollers— presses everything
together as tightly as possible. Because the resulting material is
so dense, it becomes watertight. Next, an outer layer of stone,
called riprap, is used to cover the dam. Embankment dams can
also be constructed using masonry blocks or concrete. These
types of dams are most effective when a tall dam of shorter
length is necessary— such as a dam needed for a narrow stream
running through a mountain gorge.
Occasionally, embankment dams are fi lled with rock or a com-
bination of rock and earth. Appropriately, these are called rock-
fi lled dams. They can be less broad in size than other embankment
dams because of their heavier weight. Gaps may occur between
the rocks, however, creating the need for a layer of clay or con-
crete to make the structure impervious to water. Embankment
dams are the thickest of the four types; the concrete used in the
other kinds of dams is heavier than an embankment dam’s earth
and rock. Embankment dams also are the most common type of
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THE HOOVER DAM18
dam built in the United States. The oldest embankment dam made
of rock still in use today can be found in Syria. It stands 23 feet
(7 meters) high and was built about 3,300 years ago in 1300 B.C.
Gravity DamsThe sheer weight of a gravity dam is what holds back a river’s
fl ow. On the upstream side, or the side that faces the reservoir
and oncoming water, the gravity dam’s wall is built straight up
and down. On the downstream side, the wall is built to slope. The
dam’s base width is designed to be about three- quarters the size
of its height. The gravity type is the best choice for a dam that
needs to stretch across a wide valley.
Triangular- shaped gravity dams, which were developed by
French engineer J. Augustin Tortente de Sazilly in 1850, are the
modern type still used today. De Sazilly demonstrated during a
lecture that the use of a triangular face was most effective in the
construction of a gravity dam. Although de Sazilly is credited
with this development in dam engineering, the use of this shape
dates back even further. The builders remain unknown, but tri-
angular gravity dams appeared about 100 years earlier in Mexico
(with construction dates of 1765 and 1800).
The use of concrete in dam building was another step for-
ward. Its fi rst appearance was in the Boyds Corner gravity dam
built in New York in 1872. The next innovation in gravity dams
was the use of steel rods within a dam’s concrete base to help
anchor the foundation. When this method is used, a dam does
not need to be quite as wide. The construction of gravity dams
reached its peak in the 1960s, and they are no longer used to the
same extent. One well- known example of a gravity dam is Grand
Coulee in Washington State, which required more than 20 million
tons (18.1 million metric tons) of concrete to create.
Buttress DamsA buttress dam is not as thick as a gravity dam at its base.
Its buttresses are perpendicular walls shaped like triangular
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19Before Hoover Dam
wedges that support the main, straight dam wall and bolster its
strength. The buttresses distribute the weight and pressure
of the water. This kind of dam often is cheaper to build than
a gravity dam. The use of buttresses dates back to the Roman
Empire, when they were added to a dam to support walls that
Roman engineers deemed too thin.
Arch DamsThe Romans are famous for the arches they designed into their
architectural works. Therefore, it is not surprising to discover
that they were the fi rst to build arch dams. What is rather
unusual, however, is that Roman builders rarely used this type.
The fi rst people to follow in the Romans’ footsteps and utilize
the arch dam structure were Mongolians. One of their earliest
arch dams can be found in present- day Iran. When built in A.D.
1300, it stood about 85 feet (25.9 meters) high and stretched
across its river for 180 feet (54.9 meters). The Mongolians’ sec-
ond arch dam project— located in Kurit, Iran— proved to be a
major success. Built 50 years after the original Mongolian arch
dam, the Kurit Dam reached a height of 197 feet (60 meters). This
remained the tallest arch dam in the world for more than 500
years, until the early 1900s.
Like embankment dams, arch dams are good choices when
a high but narrow dam is required. The wall of an arch dam
curves outward on the upstream side, and the weight of the
water spreads around the arch’s curve. The valley’s sides then
provide a solid foundation to support the dam against the water’s
force. Sometimes arch dams are constructed with several arches
instead of just one; these are called multiple- arch dams. The
dam’s strength comes from its curved shape, and the walls can
sometimes be as thin as 10 feet (3 meters).
Combined DamsDam types can be combined to create the best defense against
a river’s fl ow. One example of combined dam types is found in
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THE HOOVER DAM20
Nigeria, where a single dam was formed by building an embank-
ment dam at each end and a gravity dam in the center.
THE COLORADO RIVERThe might of the Colorado River is responsible for carving out
the vast and scenic Grand Canyon that many visitors love to
explore. Yet, in the 1700s, the area was largely unexplored and—
to most people— daunting. The river begins its winding journey
in the mountains of north central Colorado. It travels southwest
through the desert in twists and turns for more than 1,400 miles
(2,253 kilometers), where fi nally it empties into the Gulf of Cali-
fornia. The fi rst white people to see the Colorado were Spanish
conquistadors who came upon it in 1539. The reddish and dark
river— full of mud and silt— went nameless for more than 200
years, until 1776, the same year America’s 13 colonies declared
their independence from Britain. That year, Spanish priest Fran-
cisco Garcés named the river Río Colorado. Six tributaries stem
from the river: Green River, Gunnison River, San Juan River, Vir-
gin River, Little Colorado River, and Gila River. The Colorado and
the area surrounding these tributaries make up what is known as
the Colorado River Basin.
Following the Mexican War (1846–1848), Arizona, Califor-
nia, and New Mexico became part of the United States. People
began to think that perhaps the Colorado could serve the West
in the same way the Mississippi and Missouri rivers served
eastern parts of the country— as a means of transporting
commercial goods. The nation’s War Department also began
to consider the Colorado’s potential contribution as a means
of connecting its outposts in the remote southwestern United
States. In 1857, to help determine the feasibility of this idea,
the department ordered Lieutenant Joseph C. Ives to travel the
river. His purpose was to report on the Colorado’s suitability
and potential as a route for steam ships to carry provisions to
the area’s army forts.
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21Before Hoover Dam
THE SALUDA DAM REMEDIATION PROJECT
The Saluda Dam is located in South Carolina. It was about 70 years
old when the results of a seismic evaluation were released in 1989.
Before the dam was built, an earthquake that registered approximately
7.4 on the Richter scale had hit Charleston, South Carolina. The 1989
report determined that, if a quake of such magnitude were to hit again,
the result would be the liquefaction of the 1.5- mile- long (2.4- kilometer-
long) and 211- foot- high (64.3- meter- high) earthen dam.
The solution engineers came up with was not to reinforce the dam
itself but to create a new backup dam made of 1.3 million cubic yards
(988,000 cubic meters) of roller- compacted concrete in its center.
The dam would also need 3.5 million cubic yards (2.66 million cubic
meters) of rock fi ll to create two 5,500- foot- long (1,676.4- meter- long)
sections— one on either side of the dam’s concrete center. To provide
a proper foundation for the earth and concrete backup dam, workers
had to excavate a large area at the toe of the present dam. During the
early phases of construction, the reservoir’s water level also needed to
be lowered at a controlled rate to keep the current dam stable.
Some creative solutions were implemented during the backup dam’s
construction. One was the creation of an on- site rock quarry, which
saved both time and money because it meant tons of rock would not
need to be shipped in from various locations. Another was an innovative
recycling idea— using 200 million pounds (90 million kilograms) of coal
ash waste from a power plant in the concrete used to build the dam.
The project began in the fall of 2002 and ended in 2006. It was
named the American Society of Civil Engineers’ Outstanding Civil Engi-
neering Achievement in 2006—an award shared with other major con-
struction projects such as the Trans- Atlantic Pipeline, the World Trade
Center Towers, and the St. Louis Gateway Arch.
Building America Now
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THE HOOVER DAM22
The Colorado River (above) was recognized by the U.S. government as one of
the most powerful and vital natural resources in the United States. Beginning
in Colorado and running through Utah, the river is a natural border for Arizona
and Nevada. The waterway also runs through the famed Grand Canyon in the
southwestern United States, and has been used to irrigate local farmlands for
centuries.
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23Before Hoover Dam
Ives departed in January 1858 with a crew of 24 men. They
traveled north from Yuma, Arizona, on the aptly named steam-
boat Explorer. It was not an easy journey for the men. At one
point, the ship became damaged after hitting a rock underwa-
ter. As a result, Ives had to continue a portion of his trip on a
small wooden skiff. Despite the trouble encountered during his
mission, Ives stated in his report that the Colorado River could
indeed be used to ship supplies, but only as far as Black Canyon.
The lieutenant’s outlook on the rest of the river, however, was
much bleaker. Ives wrote in his report, “Ours was the fi rst, and
will doubtless be the last, party of whites to visit this profi tless
locality. It seems intended by Nature that the Colorado River,
along with the greater portion of its lonely and majestic way,
shall be forever unvisited and undisturbed.”
Trying to Tame the ColoradoThe Colorado gets its heavy fl ow of water in the spring from snow
melting in the Rocky Mountains, but this torrent usually dries to
a thin trickle once summer arrives. The year 1901 saw the fi rst
human effort to gain control of the mighty river. In an attempt to
help develop the area, a private company took on the job of build-
ing a canal that would reroute some of the water from the river’s
natural course. This was achieved by cutting an opening in the
Colorado’s western bank and putting in a headgate to divert the
water’s fl ow. A set of small gates and channels worked together
to bring water into Southern California’s dry Imperial Valley.
At fi rst, this system worked well and helped to irrigate fi elds,
making once barren land fruitful and bringing in thousands of
new residents. Several years later— in 1905—disaster struck in
the form of a heavy fl ood. The Colorado overtook the channel
system and continued to overfl ow into the Imperial Valley for an
entire year and a half. This continuous fl ooding destroyed most
of the area’s newly created farmland as well as many homes and
businesses. It also created today’s Salton Sea.
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THE HOOVER DAM24
President Theodore Roosevelt had to step in; he ordered a
bridge that would help dam the river. From the bridge, work-
ers dumped large amounts of rock for seven straight weeks.
By February 10, 1907, the river was back on its natural course.
Unfortunately, this was only a temporary solution. Because of
the several years of destructive fl ooding in California’s Imperial
Valley, people began to voice stronger demands for fl ood control
over the great Colorado.
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25
CHAPTER 2
Arthur Powell Davis’s Great Idea
The Hoover Dam never would have become the awe- inspiring
structure it is today were it not for the Bureau of Reclama-
tion and the vision of one man— Arthur Powell Davis. Davis’s
fascination with the Colorado River led him to push for a dam
that would have far- reaching effects for the people who lived in
the American West.
WHAT IS THE RECLAMATION SERVICE?As the American West was settled in the late 1800s, a need for
water grew. Because the West is such a dry region, the need for
irrigation— diverting water from rivers and streams to populated
areas— grew as well. Water storage was also necessary; this
would mean “saving” the runoff from rains and snows during
wet seasons for use during drier periods. In the beginning, these
types of irrigation and storage projects were funded privately or
by individual states, but they often failed due to a lack of funds
or poor engineering.
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THE HOOVER DAM26
As a result, people became increasingly interested in hav-
ing the federal government involved in such ventures. Hearing
the cry of the country’s western settlers, Congress passed the
Reclamation Act on June 17, 1902. This act would provide for
the funding and construction of needed dams, which would
eventually be repaid by those who benefi ted from them and
any accompanying irrigation networks. In those days, the term
reclamation came from the idea that irrigation would help
“reclaim” dry lands, making them usable for the people living
on them. Therefore, irrigation projects were deemed reclama-
tion projects.
In July 1902, the U.S. secretary of the interior established the
U.S. Reclamation Service, in accordance with the Reclamation
Act, which investigated possible water development projects in
the western states. From 1902 to 1907, the Reclamation Service
began approximately 30 projects, which were hoped to improve
living conditions and increase settlement and economic develop-
ment in the West. The agency underwent a name change in 1923,
becoming the Bureau of Reclamation.
Reclamation TodayToday the Bureau of Reclamation is known for the various dams,
power plants, and canals it has built since its inception— including
an impressive 600 dams and reservoirs— in a total of 17 western
states. It is currently the largest wholesaler of water in the nation,
providing 31 million people with 10 trillion gallons of the much-
needed resource. Reclamation irrigates 10 million acres (4 mil-
lion hectares) of farmland that in turn produce 60 percent of the
nation’s vegetables and 25 percent of its fruit and nuts.
Through hydroelectric power plants, the bureau is also one
of the biggest contributors to powering the West. Its 58 power
plants produce 40 billion kilowatt hours each year— enough to
keep lights on, computers running, and televisions turned on in
6 million homes. This makes the agency the second-largest pro-
ducer of hydroelectric power in the western United States.
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27
The mission statement on the agency’s Web site reads: “The
mission of the Bureau of Reclamation is to manage, develop, and
protect water and related resources in an environmentally and eco-
nomically sound manner in the interest of the American public.” In
the spirit of this mission, the bureau is involved in helping people
meet their water needs and learning to balance the competing uses
for this valuable resource. The agency emphasizes water conserva-
tion, water recycling, and reuse. It also monitors and evaluates the
dams it has created to ensure they do not pose a risk to the public,
and it makes structural modifi cations when warranted.
ARTHUR POWELL DAVIS HAS A DREAMThe year 1902, which marked the beginning of the Bureau of
Reclamation, is also the year a signifi cant idea sparked inside the
Because the western United States experiences low amounts of rainfall year
round and has limited access to fresh water, local communities rely on irriga-
tion and runoff systems for water. Above, water is delivered to local farmland
in Colorado via an irrigation system.
Arthur Powell Davis’s Great Idea
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THE HOOVER DAM28
mind of a civil engineer named Arthur Powell Davis. A graduate
of Columbian University in Washington, D.C. (which later became
George Washington University), Davis was the nephew of John
Wesley Powell, who had helped open up the West to homestead-
ing and development through his explorations of the previously
unknown and mysterious Grand Canyon and Colorado River in
the 1860s and 1870s.
A popular topic of conversation among John Wesley Powell’s
relatives was his discoveries in the West, especially the gorges
MAJOR JOHN WESLEY POWELL
It is said that, even as a child, John Wesley Powell showed an extreme
interest in the natural world. On his own, he studied botany, zoology,
and geology and made many expeditions. One of these excursions was
a solo trip in a rowboat from the Falls of St. Anthony to the mouth of the
great Mississippi River— all at the age of 22.
Powell went on to become a major after several years of military ser-
vice. The Civil War’s outbreak spurred his military career, which began
in 1860 when he joined the 20th Illinois volunteers. In one of the war’s
many battles, Powell lost his right arm. Still, on May 24, 1869, at the
age of 35, Powell led an expedition of nine other men down the Green
River in Wyoming that would bring him national recognition. The tumul-
tuous three- month journey greatly affected the team of men. After just
one month, according to the John Wesley Powell Memorial Museum’s
Web site, one of the crew members— an Englishman named Frank
Goodman— said to the major, “I’ve had more excitement than a man
deserves in a lifetime. I’m leaving.”
By the time the group reached the Grand River that would take them to
the Colorado, they had already lost one boat and were about to encounter
even more powerful and intimidating rapids. As a result of the danger,
three more men left the expedition. When Powell and the remaining fi ve
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29
found along the Colorado. As a result, in 1902, Davis turned
his attention and studies to the Colorado River. He mapped its
mountains and deserts and measured the fl ow of its streams. His
investigations brought him to a specifi c place— Black Canyon,
a scenic spot where distinctively tall and grand walls of rock
tower over the Colorado River, which enters from the southern
tip of Nevada. It was here that Davis had a vision of a great dam.
From this moment forward, the civil engineer spent the next two
decades focusing his energies on making his vision a reality.
members emerged from the previously unexplored Grand Canyon and the
Colorado River, they were hailed as heroes. Powell began giving lectures
and eventually raised enough money for a second expedition in 1871 that
resulted in a map of the area and scientifi c publications.
John Wesley Powell’s geological survey team, 1871.
Arthur Powell Davis’s Great Idea
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THE HOOVER DAM30
The Hydrographer’s BeginningsDavis was a well- respected and extremely competent topogra-
pher and hydrographer who had begun his career even before
the completion of his civil engineering degree in 1888. With
a bit of help from his famous uncle, he became an employee
of the federal government, working for the U.S. Geological
Survey as a topographer and hydrographer from 1884 to 1894.
Davis earned a promotion in 1895 and became the hydrogra-
pher in charge of government stream measurement. Another
key assignment came three years later, when he was chosen
to oversee two high- profi le hydrographic examinations. As
chief hydrographer for the Isthmian Canal Commission, Davis
helped to investigate the Panama Canal route. For several
years, he also worked as the lead hydrographer for the Nicara-
gua Canal Commission, which was responsible for determining
the feasibility of a U.S.-operated canal in Nicaragua. As part of
this process, Davis and the other members of the commission
carried out the most extensive survey of the San Juan River
ever conducted, gathering and recording information on such
things as river discharge measurements, rainfall, and geologi-
cal formations.
Davis built up an impressive resume over time. He had
worked for Powell’s Irrigation Survey, which undertook the task
of fi nding reclamation and reservoir sites in the American West.
In addition, his knowledge and expertise were put to good use
in the design and construction of numerous dams— Shoshone
Dam in Wyoming, Arrowrock Dam in Idaho, Elephant Butte Dam
in New Mexico, and Big Bend Dam in South Dakota— as well as
a large number of smaller dams, tunnels, and irrigation canals.
In his book Hoover Dam: An American Adventure, Joseph E.
Stephens says Davis “was without question the world’s leading
expert on reclamation.” Thus, it only makes sense that Davis,
after some time as an assistant chief engineer with the U.S. Rec-
lamation Service, was appointed chief engineer in 1906, and later
the agency’s director on December 10, 1914.
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31
An Idea Becomes a PlanAll that time with the Geological Survey and Reclamation Ser-
vice had made Davis a verifi able expert on the Colorado Basin,
and while he was a supervising engineer in the Reclamation Ser-
vice he envisioned an overall plan to develop the area he knew
so well. He collected crucial data on the river and its course as
well as potential dam sites; Davis believed in a future dam that
would provide fl ood control, water storage, and power genera-
tion for the dry and arid West. In Andrew J. Dunar and Dennis
McBride’s book Building Hoover Dam: An Oral History of the
Great Depression, Walker Young— who became the dam’s chief
construction engineer— talks about Davis’s plan: “Dr. Arthur P.
Davis, who was then the commissioner of Reclamation, got the
idea that a large storage should be provided for the lower Colo-
rado River near the point of use. So he originated the idea. I con-
sider him the father of the Boulder Canyon Project.”
Davis’s plan moved closer to fruition in 1922, when Congress
ordered the Interior Department (of which the Reclamation Ser-
vice was a branch) to study the Colorado Basin and its possible
development, including potential problems. The result was the
massive Fall- Davis Report. Its hundreds of pages contained all
that anyone could want to know (and more) on the hydrological
and geological aspects of the Colorado River and its surround-
ing canyons. The report covered everything from temperature
and precipitation data to current and future irrigation needs for
the region. In essence, especially for the nonexperts, the report
boiled down to one crucial nugget found on page 21, where it
recommended that the United States government build a large
dam “at or near Boulder Canyon” and recover the cost through
the revenue that would result from selling the electric power the
dam generated to ever-growing cities in the West.
The signifi cance of Davis’s work and this report was cap-
tured in a 1933 Fortune magazine article about the auspicious
dam: “Boulder Dam became a local and then a national issue.
It involved scores of prominent Americans in disputes political,
Arthur Powell Davis’s Great Idea
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THE HOOVER DAM32
fi nancial, and technical. But in the jagged valleys of the Colorado
or in Washington or anywhere else there was no dispute about
one fact: Boulder Dam was fundamentally the conception of
Arthur Powell Davis; it was everlastingly based on his monumen-
tal engineering report.”
SANTA ANA RIVER PROJECT
In California, a rockfi ll dam that could last 350 years was needed to
provide fl ood protection in the upper Santa Ana Canyon. The result
was the Seven Oaks Dam, which achieved a height of 550 feet (167.6
meters), a length of 2,980 feet (908.3 meters), and a reservoir capac-
ity of 145,600 acre feet (179.6 million cubic meters). It ranks among
the 15 tallest dams in the United States. Overall, it took 38 million
cubic yards (28.88 million cubic meters) of rock, clay, and soil placed
into 10 vertical zones to make a rockfi ll dam this large. California land
is well known for its many earthquakes, and the Seven Oaks Dam was
built with that in mind. Not only is it big, it is strong and designed to
weather earthquakes that rate as high as 8.0 on the Richter scale.
The Seven Oaks Dam is just one part of a larger project called the
Santa Ana River Project. As part of this project, another smaller dam is
also being constructed on the Santa Ana River, 40.3 miles (64.9 kilome-
ters) downstream from its larger cousin. Not actually new construction,
the Prado Dam— meant to protect California’s Orange County— is an
enlargement of a dam originally built in 1941 by the Corps of Engineers.
With the new additions, the dam’s original height will increase 28.4 feet
(8.7 meters) to reach a total height of 594.4 feet (181.2 meters).
The two dams will work together. Early each fl ood season, the
Seven Oaks Dam will be used to store runoff in its reservoir. This
Building America Now
33
Hoover Dam’s Father Fades AwayUnfortunately, because of the poor handling of the Reclamation
Service’s fi nances, Davis either resigned or was fi red from his
position as head of the agency in 1923. Even after he left the
Reclamation Service, Davis remained involved in projects that
water can then be released in small increments to maintain the water
supply that fl ows downstream. In addition, any time a fl ood occurs, the
Seven Oaks Dam will hold the water normally meant to run downstream
toward the Prado Dam. It will store this water as long as the level in the
Prado Dam’s reservoir continues to rise. Once the danger of fl ooding
has passed, the water being held at Seven Oaks will be released at a
controlled rate. At the end of each fl ood season, the Seven Oaks res-
ervoir will be drained and the Santa Ana River will once again be able
to fl ow through the area at its natural pace.
The Hoover Dam cost a great deal of money in its day, and the
price of dams has not changed much over the years. The budget for
the entire Santa Ana River Project is $1.4 billion, and the Seven Oaks
Dam alone will require a minimum of $366 million of that money for its
completion. Even with the modernization of machinery and equipment,
dam building remains a lengthy process. The contract for construction
of the Seven Oaks Dam was awarded in 1994, and building began in
May of that year. The dam was fi nished on November 15, 1999. That
means this dam— which is smaller than the Hoover Dam— took about
fi ve and a half years to complete. Construction of the Hoover Dam’s
diversion tunnels started in May 1931, and work on the entire dam was
completed in 1935—only four years later, which shows what a feat of
engineering the Hoover Dam truly was.
Arthur Powell Davis’s Great Idea
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THE HOOVER DAM34
required his extensive hydro-
logic and civil engineering
skills. He worked on projects
such as the development of
local aqueducts in California,
and in 1929 he left the United
States for two years to take a
position as chief consultant
for irrigation in Turkestan and
Transcaucasia in the Soviet
Union.
For a decade, the building
of the Boulder Dam went on
without him— Davis’s contri-
bution was lost in the fray of
political wrangling that devel-
oped around the great dam’s
construction. By the 1930s,
Davis— whose health was
deteriorating— lived in Cali-
fornia. Around the same time,
the dam’s name was changed
from Boulder Dam to Hoover
Dam, and Davis’s own name,
which had never really gar-
nered much publicity in the fi rst place, faded altogether from
the memory of those involved in its construction. Yet someone
must have remembered, because in July 1933, Interior Secretary
Harold Ickes named the now 72- year- old Davis as the dam’s con-
sulting engineer. Davis’s failing health kept him from any real
fi eldwork, and he died just one month after his appointment.
WHY BUILD A DAM?Davis’s vision ultimately provided four substantial benefi ts to
the people of the Colorado Basin area and beyond: fl ood control,
water conservation, a domestic water supply, and power.
Following in his uncle’s footsteps,
Arthur Powell Davis (above) used his
skills to explore and map the Colorado
River area for the federal government.
He compiled his research and data
into a report, recommending a dam be
constructed in order to provide power
and water to the region.
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35
Flood ControlBefore the dam’s construction, the Colorado River served as a
water source for the farms of southern California and western
Arizona. At times, however, the river that helped these areas
thrive also brought devastation in the form of fl oods that could
destroy crops and sometimes kill farmers by washing them
away. The Hoover Dam would help humans to override nature by
controlling such fl oods. In addition, the dam would help with silt
removal by collecting it above the dam. In 1933, fl oodwaters and
silt cost the Southwest’s ranchers about $2 million ($28.5 million
today) in a single year.
Water ConservationAt the time of the dam’s inception, the Colorado provided
irrigation water for 660,000 acres (264,000 hectares) of land.
Springtime in the West sees plenty of rain, but summer, fall, and
winter have much sparser precipitation. Building a dam would
mean that water from spring fl oods could be stored for future
use during the drier months of the year, helping to increase the
Arthur Powell Davis’s Great Idea
WHAT IS A HYDROLOGIST?
Water falls to the earth in the form of rain and snow; it collects in
oceans, rivers, and streams; it soaks into the soil, and it evaporates
into the air. These aspects of water’s relationship with the earth are
all part of hydrology— the study of the occurrence, distribution, move-
ment, and properties of water. A hydrologist then uses mathematical
principles and scientifi c knowledge to solve society’s water- related prob-
lems. These problems may be related to quantity, or a lack of needed
water, and to quality, water that may be available but not clean enough
for human use. More specifi c examples of issues hydrologists may try
to resolve include locating water sources for farm irrigation and working
to control fl ooding from rivers.
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THE HOOVER DAM36
principal crops of the area such as alfalfa, cantaloupe, lettuce,
barley, corn, small fruits, and cotton. In all, it would mean fi ve
to seven times more water for the summer season, or irrigation
for an additional 1.5 million acres (600,000 hectares), bringing
the original 660,000 acres (264,000 hectares) of land the river
irrigated to an astounding 2.16 million acres (864,000 hectares).
At that time, the extra 1.5 million newly irrigated acres (600,000
hectares) would equal half of all the new land opened by the U.S.
government’s 29 irrigation projects.
Domestic Water SupplyThe cities and towns of southern California, especially Los Ange-
les, made up the Metropolitan Water District. The group was
quick to sign a contract for a billion gallons of water per day for
household use at a cost of $250,000 ($2.8 million today) per year
paid to the federal government. In addition, the district spent
$220 million ($3.1 billion today) for an aqueduct to facilitate the
water’s use.
PowerOnce there was a specifi c plan for a dam, the power plant that
would help pay for its initial cost was designed to be the world’s
largest— capable of producing 1.8 million horsepower. The city
of Los Angeles and the electric company Southern California
Edison signed 50-year contracts with the government to buy the
power the dam would produce. Both would then subcontract
79 percent of this electricity (an amount set by legal standards)
to Arizona, Nevada, the Metropolitan Water District, and numer-
ous small towns in California’s valleys.
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37
CHAPTER 3
From Idea to Approved Project
A rthur P. Davis may have had the idea for a great dam in the
western desert, but a number of other men played signifi cant
roles in bringing the idea to fruition. In fact, several years of
investigation and political wrangling took place before a specifi c
plan for Hoover Dam was offi cially approved.
WALKER “BRIG” YOUNGIn January 1921, the U.S. Bureau of Reclamation initiated an
offi cial program to test the potential of damming the mighty
Colorado. Walker Young, a reclamation worker since 1911, had
signifi cant dam- building experience under his belt when he was
recruited to lead this mission by taking a team of surveyors
through the Colorado River Basin. Young had helped with the
construction of the Arrowrock Dam in Idaho. Now he was given
the task of determining what area of the basin would best suit
the construction of a large dam on the Colorado River.
The mission assigned to Young’s team of 58 men was not
without danger. They traveled each day on fl at- bottom boats
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THE HOOVER DAM38
that they rowed themselves and camped on shore each night. At
one point in their journey, a storm blew in that caused waters so
turbulent the waves seemed more like those of the ocean than a
river. Waves swelled so high that several men were thrown from
their boats.
Eventually, however, the team’s hard work and determination
paid off. They evaluated several sites and submitted the results
of their investigations. In the book Building Hoover Dam: An
Oral History of the Great Depression by Andrew J. Dunar and
Dennis McBride, Young explains one of the reasons Black Can-
yon was chosen for the dam site:
The thing that turned the tide over was the fact that one day
when I was trying to fi nd out whether we could reach the damsite
from the top . . . I discovered it was [possible] to actually build
a railroad from the main line [in] Las Vegas to the top of the
damsite. . . . There was considerable relief on the part of the chief
engineer and his crew when we found we could get the resources,
millions of tons of materials, down to that damsite on a standard
gauge railroad. As I’ve said many times, the Lord left that dam-
site there. It was only up to man to discover it and to use it.
This investigation, and the selection of Black Canyon as the
proper dam site, did not end Young’s part in the creation of what
would be the largest dam in the United States. In the summer of
1930, he was chosen as the chief construction engineer for the
Boulder Canyon Project.
HERBERT HOOVERHerbert Hoover was born in 1874 and became a millionaire
before he turned 40 years old. He gained recognition for his
efforts in relief work during World War I. Hoover, also respected
for his skills as both a mining engineer and an administrator,
gained political notice as President Warren G. Harding’s choice
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39
for secretary of commerce. He remained in this role through Cal-
vin Coolidge’s presidency. In 1928, when Coolidge made the deci-
sion not to run for a second term, it paved the way for Hoover
to become the Republican presidential nominee. Hoover had an
easy win over Democratic nominee Alfred E. Smith and became
the thirty-first president of the United States. In addition to his
most famous role as U.S. leader, Hoover also was an integral
player in getting the Hoover Dam built.
Herbert Hoover established himself as a man of action when, as the secre-
tary of commerce, he surveyed the extensive damage in flood-stricken areas
around the Mississippi River. Another major accomplishment during Hoover’s
service as commerce secretary was orchestrating the Colorado River Com-
pact, a plan that designated portions of river water to each state in the region.
Above, Hoover (back row, left) stands with flood victims.
From Idea to Approved Project
THE HOOVER DAM40
Man of the EnvironmentHoover was a man with many interests. Aside from engineering
and politics, he also had a love of nature; he was a fi shing enthu-
siast and a conservationist with a deep interest in preserving the
nation’s natural resources. Just a year into his role as Harding’s
commerce secretary, Hoover was working hard to encourage
other politicians’ interest in topics such as fl ood control, fi shery
production, natural resource protection, and the cleanup of the
country’s rivers and harbors. To draw attention to these issues,
Hoover spoke about them before Congress.
In part because of his relief work during the war, Hoover
became known as “The Great Humanitarian”—but it was a situa-
tion in 1927 that really helped him to earn that title. That year, the
Mississippi River destroyed thousands of acres of farmland due
to fl ooding. Hoover visited the site of the damage almost immedi-
ately to see how he could offer help to the people affected.
Hoover was familiar with the devastation a mighty river could
cause. As a California resident, he had taken many opportunities
during the years before World War I to visit the lower Colorado
River. So, a man of nature, Hoover was well acquainted with
the problems the river had created over the years. Yet the engi-
neer in him could also envision the river basin’s potential for
development.
THE COLORADO RIVER COMPACTLegislation to approve the building of a large dam on the Colo-
rado River was in the midst of being drafted in the early 1920s. At
the time, Hoover served as secretary of commerce under Presi-
dent Harding. Also taking place during this period was a series of
meetings to discuss water rights among the seven western states
from which the Colorado River drains water: Arizona, California,
Colorado, Nevada, New Mexico, Utah, and Wyoming. These gath-
erings of the states were Hoover’s idea. The states in the region
had been involved in long and ongoing legal battles with one
another, so Hoover urged that a Colorado River Commission be
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41
formed to fi nd a solution. The discussions that occurred during
these meetings were often contentious, because each state had
strong feelings about how to share the water fairly.
As the group’s chairperson, Hoover met in January 1927 with
state governors and other offi cials, and more meetings took place
in various locations throughout the seven states involved. Next,
commission members took part in an intense series of gatherings
in Santa Fe, New Mexico. Here they spent 10 hours a day for two
weeks trying to resolve the issue of water rights and the use of
the river’s fl ows. By the end of this 14-day period, nothing had
changed. The states just could not agree.
Realizing the stagnation in their talks, Hoover— who had
attended each and every meeting— came up with a plan of his
own, trying to take each state’s concerns into account. His idea
became known as the Colorado River Compact. According to
the plan, the water would be shared among the seven states,
which would be divided into two groups— the Upper Colorado
Basin and the Lower Colorado Basin. The Upper Basin states
would consist of Colorado, New Mexico, Utah, and Wyoming.
The Lower Basin states would include Arizona, California, and
Nevada. Details of how water would be shared between the two
groups were not fi nalized, but the compact was a good start. All
the states except Arizona accepted the Colorado River Compact.
Arizona’s protest did not stop the compact from being signed
by the six other states on November 24, 1922, fi nally ending the
long- standing controversy of water division in the West. This
compromise refl ected well on Hoover, who was praised for the
way he had handled the matter.
Even with this development, legislation for the dam’s authori-
zation moved slowly. Calvin Coolidge endorsed the legislation for
the dam, but it did not have time to take effect during his presi-
dency. On June 25, 1929, President Hoover signed a proclamation
that made the Colorado River Compact effective. According to
the U.S. Bureau of Reclamation’s Web site, Hoover held a press
conference that same day. Speaking to reporters, he said that the
From Idea to Approved Project
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THE HOOVER DAM42
compact was “the fi nal settlement of quarrels that have extended
over 25 years . . . the most extensive action ever taken by a group
of states under the provisions of the Constitution permitting
compacts between states.”
THE BOULDER CANYON PROJECT ACTCongressman Phil Swing and California senator Hiram Johnson
presented the Boulder Canyon Project Act in 1923. Their legis-
lation, known as the Swing- Johnson Bill, was the fi rst of three
versions introduced between 1923 and 1926. Unfortunately,
none of the bills was ever brought to a vote. In February 1927,
the bill’s third version made it further through the legislative
process than its predecessors, but it still remained blocked from
the voting stage. The bill was rewritten and submitted again in
December of that same year. On May 25, 1928, it passed in the
House of Representatives but was blocked in the Senate with
a fi libuster. However, at long last, during the Senate’s second
session beginning in December 1928, the Swing- Johnson Bill
passed. President Coolidge signed the piece of legislation, mak-
ing it law one week later.
Following the fi nalization of the long- awaited Colorado River
Compact, President Hoover was able to sign a proclamation in
June 1929 that made the Boulder Canyon Project Act effective.
This action was the fi nal authorization needed to spend $165
million ($1.9 billion today) on the much- anticipated Boulder Dam
and its accompanying All- American Canal.
WHAT’S IN A NAME?Before the Hoover Dam was constructed, when the idea for such
a dam was in its early stages, the project was known as the
Boulder Canyon Project. Even when it was fi nally determined
that Black Canyon would be the optimal site, instead of Boulder
Canyon, the people involved retained the Boulder Canyon name
due to its familiarity. Once plans for the dam were made fi nal, its
offi cial name became Boulder Dam.
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43
On September 17, 1930, U.S. Secretary of the Interior Ray
Lyman Wilbur attended a ceremony to mark the initial laying of
railroad lines from Las Vegas to Black Canyon. At the ceremony,
the interior secretary was to drive a silver railroad spike into
the ground. W.A. Davis, who was living in the area at the time,
recalled in the PBS film American Experience: Hoover Dam,
“Secretary Wilbur drove the spike, he missed it about three or
four times. And of course there was a lot of miners in the back-
ground to tell him what a poor punk he was. I think that he was
quite embarrassed.”
Yet this embarrassment was not what made headlines: It was
Wilbur’s address to the crowd that really caught people’s atten-
tion. He announced, “I have the honor and privilege of giving a
name to this new structure. In Black Canyon, under the Boulder
Hoover Dam aT a GLanCe
It reaches a height of 726 feet (221.3 meters), which
makes it 171 feet (52.1 meters) taller than the Washington
Monument.
The top of the dam is 45 feet (13.7 meters) thick. The base
is 660 feet (20.2 meters) thick, the equivalent of two foot-
ball fields laid end to end.
The dam (including the power plant, intake tunnels, etc.)
was created from 4.5 million cubic yards (3.4 million cubic
meters) of concrete. That would be enough to build a two-
lane road from Seattle, Washington, to Miami, Florida.
The dam’s total weight is 6.6 million tons (5.9 million
metric tons).
Each of the power plant’s generators weighs 4 million
pounds (1.8 million kilograms), about the same as four-and-
a-half fully loaded airplanes.
★
★
★
★
★
From Idea to approved Project
THE HOOVER DAM44
Secretary of the Interior Ray Lyman Wilbur (above) traveled out
West to drive the fi rst commemorative spike marking the start of
dam construction. At this ceremony, Wilbur announced the dam
would be renamed Hoover Dam, after President Herbert Hoover.
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45
Canyon Project Act, it shall be called the Hoover Dam.” Herbert
Hoover was president at this time, and Wilbur’s boss. Wilbur
went on to describe Hoover as “the great engineer whose vision
and persistence, first as chairman of the Colorado River Com-
mission in 1922, and on so many other occasions since, has done
so much to make [the dam] possible.”
a new name strikes displeasureThe interior secretary’s announcement met with little accep-
tance. Only seven months after Hoover’s inaugural address, the
Great Depression had struck. As president, Hoover declined to
provide government assistance for all of the people who were
struggling during the difficult economic times. Hoover’s reason-
ing was that he did not want Americans to become dependent on
the federal government for help. Needless to say, a large percent-
age of the American population was dissatisfied with his per-
formance as the nation’s leader. To them, naming the dam after
Hoover was an insult.
Following Wilbur’s declaration, the dam went by both
names, depending on who was discussing the project. In the
press, the name was used interchangeably; sometimes it was
called the Boulder Dam, and other times it was referred to as
the Hoover Dam. However, in any official documents, the name
appeared as Hoover Dam. The naming controversy, however,
was far from over.
Back to Boulder damWhen Hoover lost the presidency to Franklin D. Roosevelt, Har-
old Ickes replaced Wilbur as the country’s secretary of the inte-
rior. On May 8, 1933, Ickes made an announcement of his own:
The name of the dam would officially revert back to Boulder
Dam. According to the PBS American Experience: Hoover Dam
Web site, Ickes said, “The name Boulder Dam is a fine, rugged,
From Idea to approved Project
(continues on page 48)
THE HOOVER DAM46
THE BIG DIG
When the Hoover Dam was built, it was the largest public works project
ever undertaken; however, that record no longer stands. Boston’s Big
Dig now ranks as the largest public works project in U.S. history. What,
exactly, is the Big Dig?
The project’s offi cial name is the Central Artery/Tunnel Project (CA/T).
Boston’s Central Artery highway opened in 1959, and back then it easily
carried the 75,000 vehicles a day that rolled along its six lanes. Over
the years, problems began to develop as the population and its use of
vehicles increased. By 2000, stop- and- go traffi c jams were happening
for 8 to 10 hours every day. Use of the highway had risen from 75,000
vehicles a day to nearly 200,000. Experts projected that, if no changes
were made, by 2010 the people of Boston would be sitting in traffi c jams
almost 16 hours a day.
Initial designs for the new construction began in the early 1980s,
with fi nal plans drawn up late in the decade. Actual construction began
in 1991. The 6-lane highway would be replaced by an 8-to-10-lane under-
ground expressway built directly beneath it. A brand- new 14-lane bridge
would be built to cross over the Charles River, and the current Interstate
90—known as the Massachusetts Turnpike— would be extended.
Whereas the Hoover Dam was built in the middle of nothing but
sun and desert, the Big Dig took place in the heart of bustling Boston.
The trick was to determine how to progress with construction without
disrupting the city’s daily functions. The job resulted in the excavation
of 16 million cubic yards (12.16 million cubic meters) of dirt— enough
to fi ll a large sports stadium 15 times! It took 541,000 truckloads and
4,400 barge loads to move this material.
Building America Now
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47
Although this construction project was not a dam, it had several
things in common with the Hoover project. At the peak of its construc-
tion, the Big Dig employed 5,000 workers— approximately the same
number that worked at Hoover Dam’s peak. Cofferdams were part of
the Hoover Dam construction, and a cofferdam played an important
role in the Big Dig. To place the South Boston connection that runs
from the underwater part of the Ted Williams Tunnel to the land- based
approach, workers needed to create the widest, deepest circular cof-
ferdam ever seen in North America. Hoover had its diversion tunnels,
and the Big Dig had its own distinctive tunnels: Of the 161 miles
(259.1 kilometers) of highway built during the project, half were tun-
nels. Both projects required an enormous amount of concrete— the
Boston project placed 3.8 million cubic yards (2.888 million cubic
meters) of the material. The amount of steel needed for reinforcement
at the Big Dig was huge as well: the amount of steel used could create
a 1-inch (2.5-centimeter) bar that could wrap itself around the globe at
the equator! There was, however, one big difference between the two
projects. The Hoover Dam had just one construction contract with Six
Companies, but the Big Dig had a total of 118 separate construction
contracts.
Completion of the Big Dig was offi cial in 2007. The Central Artery
would now be able to handle 245,000 vehicles a day, and the Ted Wil-
liams Tunnel would accommodate an additional 98,000 users daily.
Instead of 10 straight hours of stop- and- go traffi c, Boston commuters
can expect more normal urban rush- hour traffi c— with speeds of 30
mph (48.3 kph) slowing things down for just a few hours in the morn-
ing and evening.
From Idea to Approved Project
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the hoover dam4�
and individual name. The men who pioneered this project knew
it by this name.” In his memoirs, Hoover said he was not bothered
in the least by this development. However, President Hoover’s
last-minute trip to the dam’s construction site—just after he
lost his bid for a second term in office—revealed his continuing
passion for the project. The Bureau of Reclamation’s Web site
reports that, after Hoover ordered a brief stop while flying from
Washington to California in November 1932, he spoke emotion-
ally at the site:
The waters of this great river, instead of being wasted in the sea,
will now be brought into use by man. Civilization advances with
the practical application of knowledge in such structures as the
one being built here in the pathway of one of the great rivers of
the continent. The spread of its values in human happiness is
beyond computation.
the return of hoover damMore than 10 years later, on March 4, 1947, House Resolution 140
was introduced and later passed in Congress. The first paragraph
states:
Herbert Hoover, while Secretary of Commerce in 1922, presided
as the representative of the Federal Government over two
score meetings of the representatives of Arizona, California,
Colorado, Nevada, New Mexico, Utah, and Wyoming for the for-
mulation of the Colorado River Compact. He had a major part
in bringing the States into agreement. This compact, signed
November 24, 1922, made construction of the dam possible by
allocating the waters of the river system between the upper and
lower Colorado River Basin, settling a 25-year-old controversy.
The Boulder Canyon Project Act, enacted December 21, 1928,
when Mr. Hoover was President-elect, ratified the compact and
authorized construction of a dam in Black Canyon or Boulder
(continued from page 45)
49
Canyon, leaving to the Secretary of the Interior the choice of
sites. It also laid upon him and the Secretary of the Interior
extraordinary responsibilities.
The resolution further explains Hoover’s involvement in the
project and concludes with, “It is particularly timely that this
measure honoring Mr. Hoover should come to the fl oor of the
House at a time when he is completing the second of his great
humanitarian missions for President Truman in the relief of
world- wide suffering.” The resolution and the name Hoover Dam
became offi cial one month later, when President Truman signed
the document on April 30, 1947.
THE BIRTH OF SIX COMPANIESThe Boulder Dam was set to be the largest public works project
the U.S. government had ever undertaken. The federal gov-
ernment accepted bids from hundreds of eager construction
and engineering companies that hoped to walk away with a
multimillion- dollar contract for a highly visible project. One of
the government’s requirements of the bidding companies was a
$5 million ($60 million today) performance bond from whoever
won the contract. Such a large amount of money became a deter-
rent for many potential bidders; it was too big a risk for most
individual companies to take.
Contemplating a way to lessen this risk was Harry Morrison
of the construction fi rm Morrison- Knudsen in Boise, Idaho. Mor-
rison decided that the best way to bid for this coveted job was to
form one company from several different ones. He already had an
alliance with a company called Utah Construction and believed
that it should be involved in what at the time was still being
called the Black Canyon Project. Another choice of Morrison’s
was a highly regarded tunnel and sewer builder named Charlie
Shea, who contributed $500,000 ($6 million today) toward the
$5 million performance bond. Shea was known to be a real char-
acter and had the charm and connections needed to bring in
From Idea to Approved Project
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THE HOOVER DAM50
other players. Among them were the Pacifi c Bridge Company and
Felix Kahn from the San Francisco company that bore his name,
MacDonald & Kahn.
Another longtime San Francisco contractor, Warren A.
Bechtel, also wanted to be a part of Morrison’s expanding team.
Bechtel was the mentor to a much younger Oakland, California,
resident named Harry Kaiser. Kaiser began work at the age of
11 after he had dropped out of school. Bechtel appreciated the
younger man’s ambition and work ethic as a road builder, so he
suggested that the two of them ally themselves with the group
Morrison was working to put together. This team of men and
their companies called itself Six Companies— a name provided
by Felix Kahn. It became an offi cial corporation on February 19,
1931.
Six Companies now had the money available for the perfor-
mance bond; the next step was to submit its bid. Bid submission
was a tricky business. Rumor had spread that the Reclamation
Services’ engineers had already established precisely what the
massive project should cost, so it was important that a bid not be
too high yet remain profi table for the company submitting it. At
Morrison’s request, the men of Six Companies turned to Frank
Crowe— one of the construction industry’s most admired men
and a valued employee of Morrison- Knudsen. Crowe made his cal-
culations carefully and gave his recommended bid: $48,890,995
($571.3 million today). This bid was more than appropriate;
it was right on target. On March 4, 1931, when the sealed bids
were opened at the reclamation offi ce, Crowe’s recommendation
secured the government contract— the largest that had ever been
awarded. Six Companies’ winning bid was only $24,000 away
from the Reclamation Services’ own estimate.
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51
CHAPTER 4
The People Who Built Hoover Dam
Once the legislation and funding for the Hoover Dam were
approved, an army of workers was needed—5,000 at the con-
struction’s peak— to build what would come to be known as one
of the seven wonders of the modern world. From the supervisors
who led these men and created the dam’s design to the workers
themselves, everyone had an important contribution to make.
THE DAM’S WORKERSThe Hoover Dam’s construction occurred at a desperate time in
U.S. history. The stock market had crashed, leaving the Great
Depression to settle in, and an almost unimaginable number
of people were unemployed. Once the government approved
the dam’s creation, people realized that many hands would be
needed to bring the ambitious project to fruition. As rumors
started to circulate about potential jobs— even though Six Com-
panies was not offi cially hiring yet— thousands of people packed
up their families and moved to the harsh Nevada desert in search
of work. In the fi lm American Experience: Hoover Dam, worker
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the hoover dam52
W.A. Davis said, “We was in a depression, fl at on its back, belly
up. The press made an announcement that the government was
going to build the largest dam in the world, so I went over to a
car lot and bought a ’26 Essex car for $75 [$876 today], got into it
and took off for Las Vegas.”
Living in ragtownFamilies had two choices once they arrived in Nevada. They
could fi nd a place to settle in the tiny railroad town of Las
Vegas— which had a population of 5,000—or they could simply
make do in the undeveloped Black Canyon area. Most chose
the latter option, believing that close proximity to the construc-
tion site would help in securing a job, because Las Vegas (at 30
The budget for the entire project ranged from $30 to $40 million. In
addition to the dam and reservoir, the project includes an intake and
pump station as well as a pipeline that will take water from the reser-
voir to the Etowah River— the city’s current water supply.
One of the interesting aspects of this project is how the reservoir is
fi lled. The total time estimated to fi ll the new lake is one to two years.
The rate at which the reservoir fi lls is based on the dam’s height and
the guidelines set forth by the Georgia Safe Dams Program. The fi rst
third of the lake will fi ll at an uncontrolled rate, but for safety reasons,
the next two phases of the fi lling process will be controlled. The sec-
ond third of the reservoir will be fi lled at a rate of 2 feet (0.6 meters)
per week. The fi nal third of the fi lling will take place at a rate of 1 foot
(0.3 meters) per week. When fi lled to capacity, the reservoir will hold
5 billion gallons (19 billion liters) of needed water, 44 million gallons
(167.2 million liters) of which can be used each day by the city and
county’s people.
HiCKory LoG CreeK
The city of Canton, Georgia, decided to build a dam and reservoir on
Hickory Log Creek. The dam and its reservoir will provide a much-
needed long- term source of drinking water— enough to keep residents
from being thirsty until at least the year 2050. The reservoir also will
serve as a backup water supply in case of drought. The dam is one of
the state’s largest not built by the Corps of Engineers or Georgia Power.
Instead, the City of Canton joined forces with the Cobb County- Marietta
Water Authority to accomplish what neither group could do alone.
Plans were developed in 2005 and the new dam—located just
north of the city’s downtown area—was completed in December 2007.
It spans the river at a width of 950 feet (289.6 meters) and reaches
toward the sky at a height of 180 feet (54.9 meters). The all- important
reservoir will cover 370 acres (148 hectares) of land and provide resi-
dents with 15 miles (24.1 kilometers) of scenic shoreline.
Building America Now
53
miles, or 48.3 kilometers, away) would mean a tough commute.
The fl oor of the Black Canyon became an impromptu town, cov-
ered with tents and cardboard boxes. Ragtown, as it was called,
had its fair share of “campers” as well— cars with strategically
placed cardboard and canvas that allowed people to live out of
their vehicles. On the PBS American Experience Web site, one
dam worker’s daughter, Ila Clements- Davey, said of Ragtown,
“There was just nothing. There was no facility. Nothing. There
was nothing green around here. Everything was baked, hot, and
brown.”
Indeed, the area’s temperatures, which regularly skyrock-
eted to 120ºF (49ºC), made Ragtown life diffi cult. One mother,
Erma Godbey, draped wet sheets over her baby to keep the baby
The People Who Built Hoover Dam
The budget for the entire project ranged from $30 to $40 million. In
addition to the dam and reservoir, the project includes an intake and
pump station as well as a pipeline that will take water from the reser-
voir to the Etowah River— the city’s current water supply.
One of the interesting aspects of this project is how the reservoir is
fi lled. The total time estimated to fi ll the new lake is one to two years.
The rate at which the reservoir fi lls is based on the dam’s height and
the guidelines set forth by the Georgia Safe Dams Program. The fi rst
third of the lake will fi ll at an uncontrolled rate, but for safety reasons,
the next two phases of the fi lling process will be controlled. The sec-
ond third of the reservoir will be fi lled at a rate of 2 feet (0.6 meters)
per week. The fi nal third of the fi lling will take place at a rate of 1 foot
(0.3 meters) per week. When fi lled to capacity, the reservoir will hold
5 billion gallons (19 billion liters) of needed water, 44 million gallons
(167.2 million liters) of which can be used each day by the city and
county’s people.
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THE HOOVER DAM54
cool. This was the key to successful living in Black Canyon—
improvisation. When a baby’s diapers needed to be cleaned, a
mother could boil them in bleach over a campfi re. If a family
needed a place to sit, a bench was formed by placing an ironing
board on top of a couple crates.
Because the canyon’s location was near the Colorado River,
there was more than enough water for washing. Drinking the
river’s water, however, was another story; it tended to cause ill-
nesses such as dysentery. Fresh milk and other food products
that could spoil also were not an option. They could not be kept
because of the intense heat. Therefore, meals in Ragtown often
consisted of some type of canned food.
FRANK CROWEIn the 1930s, if you needed a dam built, Frank Crowe was the
man to do it. Over the years, he had built up a remarkable repu-
tation for effi ciency and innovation in large- scale construction
projects. Crowe was born in the town of Trenholmville in Que-
bec, Canada, in 1882. He moved to New England early in his life
and studied civil engineering at the University of Maine in 1901.
There, during the speech given by a member of the U.S. Reclama-
tion Service, Crowe’s keen interest in the western United States
was sparked. By the end of the guest speaker’s talk, Crowe had
signed up for a summer job as a surveyor in the drainage basin
of the Yellowstone River in Montana. This would be the start of
his 20-year history with the Reclamation Service.
By 1924, Crowe was the acting general superintendent of
construction for reclamation and was responsible for projects
in 17 western states. He had become well known for developing
effi cient construction methods. In addition, the devoted engi-
neer was instrumental in bringing new and unique construc-
tion equipment into use. One such innovation was the overhead
cable system fi rst used during the building of Idaho’s Arrowrock
Dam in 1911. This cable system would prove invaluable years
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55
later, during the Hoover Dam’s construction. Another of Crowe’s
developments was the use of a pipe grid to transport cement
pneumatically, or by using compressed air.
When the federal government began using private companies
for dam projects, Crowe was not pleased; after two decades as
a government worker with the Reclamation Service, he left to
pursue work in the private sector. He joined Morrison- Knudsen,
a company that had just aligned itself with Utah Construction for
When the Hoover Dam project was announced in the middle of the Great
Depression, thousands of people traveled to the area in hopes of fi nding
employment. While some workers and their families settled in Las Vegas,
Nevada, many others constructed makeshift homes in nearby Black Canyon
(above), which created a new community known as Ragtown.
The People Who Built Hoover Dam
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THE HOOVER DAM56
the purpose of building dams together. This move allowed Crowe
to do the work he loved— instead of being stuck in an offi ce,
he could get out into the fi eld. During his time with Morrison-
Knudsen, he supervised the construction of several dam proj-
ects, including Guernsey in Wyoming, Coombe in California,
and Deadwood in Idaho. His next accomplishment, and the most
recognized in the world of dam building, was the Hoover Dam.
Standing about 6 feet 4 inches (1.9 meters) in height, Crowe
had a commanding presence as well as a reputation for being
fi rm. Yet the long- time engineer also was viewed as a fair man
who was good at his work. Among his achievements was taking
a ragtag bunch of unemployed men and turning them into world-
class builders.
CONDITIONS ON THE JOBOnce initial work began in the Arizona and Nevada deserts, condi-
tions proved harsh. Summer temperatures often soared to 120°F
HOOVER DAM’S MASCOT MUTT
The hardworking men of the Hoover Dam had a faithful companion at
the site: A black- haired dog with a furry white chest often kept them
company. No one really knows where the canine came from, but the
men liked to say that he was born under the fl oorboards of one of their
dormitories. The kitchen staff at Anderson Mess Hall even made a sack
lunch each day for the furry worker, who traveled to and from the site
with the men.
Sadly, the men’s beloved coworker died “on the job.” He was sleep-
ing peacefully under a truck and out of the hot sun when he was crushed
by the truck’s tires because the driver did not know the dog was there.
The dog was buried at the dam site, and his friends placed a memorial
there in his honor.
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57
(48.9°), and winter temperatures could plummet to the freezing
point and below. Regardless of the temperature, the men had to
keep a quick pace—supervisors and managers had strict dead-
lines to enforce. The combination of working hard and fast in the
scorching desert sun took its toll; a total of 14 men died of heat
exhaustion. Helen Holmes’s husband, Neil, collapsed from the
the People Who Built hoover dam
Dedicated to hard work and efficiency, Frank Crowe (above) was
chosen to manage the construction of the Hoover Dam. Known
for his hands-on style in managing other successful dam proj-
ects, Crowe stuck to his motto, “never my belly to a desk,” and
could be seen surveying the Hoover Dam work site at 2:00 a.m.
THE HOOVER DAM58
heat in the summer of 1931. In Dunar and McBride’s book Build-
ing Hoover Dam, Holmes described the situation that summer:
The men were going out with the heat. They called it passing
out. Summer temperatures went terrifi cally high. The ambu-
lance would go up so many times with the people . . . they’d have
to pack them in ice and take them up. Of course, that siren— oh,
it scared you ’cause you wondered if it might be your husband.
Extreme heat and cold and the pressure of deadlines were
not the only hardships Hoover’s workers faced. Six Companies
sometimes skimped when it came to workers’ safety. Because
of the Depression, Six Companies knew that workers would be
reluctant to complain— for every one man who worked on the
site, there were hundreds more, possibly thousands, willing to
take his place. The company sometimes chose to save a few pen-
nies here and there, even if it meant endangering the workers’
health and safety. Workers faced danger on the job every day: If
they were not careful, they could suffer carbon monoxide poison-
ing, dehydration, or electrocution.
The Workers’ StrikeThe workers’ fear of making demands changed in the summer of
1931. On August 7, Six Companies made the decision to reassign
several men who were to work on the dam’s diversion tunnels.
The new assignment for this handful of workers would mean
lower wages for them. Apparently, this was the last straw for
the men at the site. The entire group of dam workers went on
strike within only a few hours of Six Companies’ demotion of a
few of their brothers. Six Companies, trying to maintain calm
and keep the situation at bay, explained that only 30 men would
be affected by the reassignment. Yet Six Companies’ words did
little good. The workers took the opportunity to protest not only
issues of pay but also the need for improved working conditions,
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59
such as readily available clean water and fl ush toilets, ice water
at the site for drinking, and the use of Nevada and Arizona min-
ing laws to establish safer working conditions.
Six Companies stood fi rm. Its leaders knew that the workers
had little leverage, because they could so easily be replaced. Even
Frank Crowe took the side of his employer, supporting the com-
pany rather than his men. He demanded that his workers return
to their jobs or leave the dam site altogether. Crowe’s stance on
the labor dispute caused a division among the striking men.
Before giving up the battle, the workers turned to U.S. Secre-
tary of Labor William Doak for help. Unfortunately for the men,
Doak refused to become involved. Six Companies fi red a good
number of the striking workers. Afraid for their own jobs, the
other men decided that any work was better than no work, and
after eight days off the job everyone returned to the site.
Conditions ImproveThe strike was not a complete failure, however: Six Companies
effected a number of improvements afterward. The company
promised that the pay cut the 30 men received would be the last
any of the workers would ever have to worry about. Lighting was
added to improve visibility at the site; water was made available
for the workers; and the completion of Boulder City— the town
that would take workers out of the misery of Ragtown— was
made a higher priority. In Dunar and McBride’s book, Elton Gar-
rett, a Las Vegas journalist during the dam’s construction, said
of the strike:
To a certain extent it did help. Management tried to be reason-
able, and at times they improved conditions for the workers.
They didn’t give in to them and say, ‘You can have all your
wishes.’ They didn’t do that. The depression gave this whole
country a climate where management could dictate terms
pretty much.
The People Who Built Hoover Dam
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THE HOOVER DAM60
BOULDER CITYThe government and Six Companies had not planned on Rag-
town. Included in Six Companies’ government contract was
an agreement that the company would provide housing for
80 percent of its workers. Plans were to build a small, simple,
bare- bones town. Walker Young had chosen a location 7 miles
(11.2 kilometers) from the construction site to build a camp
that thousands of people could call home. This camp— Boulder
City— was intended to be ready for the workers before they
arrived. However, the stock market crash and the Great Depres-
sion that followed spoiled that plan; anxious men hoping for any
type of work arrived before even one house could be built. As
soon as the funds to build Boulder City became available, work
started on the tiny town.
Although Boulder City was for the workers hired by Six
Companies, it was not run by the organization. Instead, Boulder
City was considered a federal reservation; it fell under the juris-
diction of the Reclamation Service and the federal government.
The “town” consisted of large dorms for single men and compact
houses with one to three rooms for workers with wives and
children.
A Plain Ol’ TownConstruction in the town was ongoing, and workers built as
many as three houses each day. The homes all looked alike; sto-
ries abound of men coming off their shift, returning home, and
walking into the wrong house. In Dunar and McBride’s Building
Hoover Dam, Boulder City resident Wilma Cooper recalls what
the quickly built homes were like: “These houses were put up in
one day, child. You think you can put a house up in one day and
have it look like anything? They never were comfortable, because
there was no insulation in ’em. And the sheetrock inside was so
thin— you sneeze on it, you’d blow a hole in it.”
Besides roofs over the heads of workers and their families,
Boulder City had little to offer. It had a library and a church, but
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61
no school for the children. The government had not provided
funds for a school, so the residents took it upon themselves to
start one. Six Companies later helped to build a makeshift school
where the town’s children could receive some sort of education.
A hospital—also paid for by Six Companies—opened in 1932, but
its doctors and nurses tended only to the workers. No health care
was provided for the women and children in Boulder City. One
further addition to the town came during the workers’ strike in
1931, when a security gate was placed at the entrance.
Boulder City (above) was constructed so that dam workers and their families
could live in decent housing, rather that in the shacks that filled Ragtown. The
community expanded rapidly, and soon 12 tons of fruit and vegetables, 5 tons
of meat, and over 2 tons of eggs were being shipped to Boulder City’s giant
dining hall every week.
the People Who Built hoover dam
THE HOOVER DAM62
Sims Ely: LawmanSixty- nine- year- old Sims Ely was appointed Boulder City’s mayor,
judge, unoffi cial lawman, and conscience. Ely had been a news-
paper editor in his younger days, as well as an employee of the
justice department. The gruff Ely made certain that the town’s
residents followed the rules of no gambling and no drinking,
which set Boulder City apart from nearby Las Vegas, known to
cater to those particular vices. One Boulder City resident, Mary
Ann Merrill, said about Ely on the PBS American Experience
Web site, “I guess he was fair in a lot of ways, but he had his own
ideas and he put them into practice. And you had to go by his
rules. He thought of it as his town.”
Three Square Meals a DayOne of the great benefi ts of living in Boulder City during the
surrounding country’s Depression was the mess hall run by
Anderson Brothers, a California company. For an affordable
$1.50 a day ($19.22 today), a resident of the town could get three
daily meals— and eat as much at each meal as he or she desired.
People in Boulder City ate better than most people in the United
States at the time. Every day, the mess hall staff dished out 6,000
meals— or 12 tons (1.1 metric tons) of fruits and vegetables,
5 tons (0.5 metric tons) of meat, and 2.5 tons (0.2 metric tons)
of eggs every week! Holiday meals were especially appreciated
by the workers and their families. The University of Las Vegas
Libraries Web site on the Hoover Dam quotes worker Marion
Allen as saying, “You’d go up there [the mess hall], and Thanks-
giving cost a whole 75 cents [$9 today]. The wife and I, 75 cents
apiece; for the girl, it was free. So that cost $1.50 [$18 today].
You’d have turkey, roast beef, anything under the sun as long as
you wanted.”
A Temporary Town That LastsUnlike construction camps built for other projects, Boulder City
did not disappear after the dam’s completion. In fact, the town
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63
remained a federal reservation until 1959. By 1997, it had grown
into a town with a population of 14, 000.
AFRICAN AMERICANS ON THE JOBIn May 1931, the Colored Citizens Labor and Protective Associa-
tion of Las Vegas raised a complaint against Six Companies and
its hiring practices. The issue? Of the fi rst 1,000 workers hired,
none were African American. About a year later, Six Companies
tried to explain its lack of black workers at the Hoover site.
When National Association for the Advancement of Colored
People (NAACP) fi eld secretary William Pickens visited the area,
Six Companies executives told him that they had experienced
A MATTER OF WAGES
What a man earned at the Hoover Dam work site depended on the spe-
cifi c job he was assigned to do. One truck driver, Lee Tilman, remembered
working for 10 months straight— seven days each week— without one
day off. Earning $5.00 a day ($60.00 today) for his efforts, he thought
the pay was pretty good. On average, workers at the dam earned
62.5 cents per hour ($7.50 today), with the lowest earners receiving
50 cents per hour ($6.00 today) and the highest earners receiving
$1.25 per hour ($15.00 today). Following are some examples of differ-
ent workers’ hourly wages: muckers and general laborers, 50 cents;
jackhammer men and cement fi nishers, 62.5 cents; truck drivers, 50
to 75 cents; carpenters, 62.5 to 75 cents; tool sharpeners, crane
operators, and electricians, 75 cents ($9.00 today); and shovel opera-
tors, $ 1.25.
Workers received only half of their wages in U.S. currency. The other
half was paid in scrip— money printed by Six Companies that could only
be spent in the Six Companies store in Boulder City. Workers could
spend scrip on anything from food to new clothes.
The People Who Built Hoover Dam
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THE HOOVER DAM64
problems with racial tension at other job sites. They cited as an
example one nearly violent incident in which a Mexican foreman
had been put in charge of a white crew.
Pressure to hire African- American workers continued to
mount. Eventually, Six Companies president William Bechtel
said they would add black workers to the current group of
men— but this claim did not amount to much. By 1933, only 24
African- American men were employed at the Hoover Dam. Not
only did African- American workers make up less than one per-
cent of the Six Companies workforce, they also were forced to
take the sweatiest and most undesirable job at the construction
site— shoveling in the hot sun of the Arizona gravel pits.
These 24 workers faced segregation as well. African Ameri-
cans (as well as Native Americans and Hispanics) were not
allowed to live in Boulder City. This meant they rode segregated
buses 30 miles (48.3 kilometers) to work from their homes in the
slums of Las Vegas. As if that were not insult enough, at the job
site the men were forced to drink from separate water buckets
than those used by the thousands of white workers.
GORDON B. KAUFMANNGordon Kaufmann was a well- known architect famous for his
modern designs. Originally from England, Kaufmann moved to
southern California in 1913. He was chosen for the Hoover Dam
project because people thought he could give the dam the strong,
super- technology look they hoped it would have.
Kaufmann sat down with the plans originally drawn up by
engineers from the Bureau of Reclamation. Their design had a
distinctively classic style, but that style seemed to clash with
the rest of the dam’s smooth, clean design. Once Kaufmann
reviewed these ideas, he set them aside and began work on his
own sketches and ideas. The result was a fl uid design meant to
work seamlessly within the entire dam structure. The design was
intended to showcase the dam’s most impressive and signifi cant
feature— its gigantic concrete downstream face. As part of his
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65
design facelift, Kaufmann redesigned Hoover’s power plant,
giving it such touches as art deco metal fi ns for its windows.
For the power plant’s interior, he hired Alan True, who gave it
its uniquely patterned fl oors and modern color schemes. In his
design renovations, Kaufmann even took the dam’s spillways
into account, making sure that they would refl ect the smooth,
curved surfaces of the dam itself.
The People Who Built Hoover Dam
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66
CHAPTER 5
Construction Begins
The Hoover Dam was an ambitious project: The massive,
curved gravity dam would be the single-biggest construction
project the United States had ever seen. Yet, another factor made
building the dam an even more ambitious feat to accomplish— it
was being built in the middle of nowhere, an area with no exist-
ing roads or sources of electricity. The previously untouched
land meant that construction of an infrastructure would be
needed before the construction of the dam.
DIVERTING THE COLORADO RIVERBefore work could begin on the massive dam, the mighty Colo-
rado had to be dealt with. A dry, empty workspace was necessary
to build the 726- foot- high (221.3-meter- high) dam. Workers would
have to divert the Colorado’s natural fl ow around the future work
site. To accomplish this task, massive diversion tunnels and cof-
ferdams were constructed.
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67
Diversion TunnelsTo reroute the river, four diversion tunnels— each 56 feet (17.1
meters) in diameter and three-quarters of a mile (1.2 kilometers)
long— were planned. These would be created by blasting right into
the canyon’s thick rock walls. Two tunnels would be constructed
on the Nevada side, and another two would be constructed on
the Arizona side. Work on the Nevada diversion tunnels began on
May 12, 1931, with work on the Arizona tunnels starting not long
afterward. Six Companies and its workers had a strict govern-
ment deadline to meet. If the Colorado was not diverted within
two and a half years, Six Companies would have to pay a hefty
fi ne for each additional day it took to fi nish the job. The digging,
blasting, and debris removal continued for 13 months, with men
working 3 shifts 24 hours a day, 7 days a week.
Because no roads led into the canyon, men (as well as equip-
ment) arrived at the work site by boat. Workers used 500 pneu-
matic drills, hoses, and compressors to make holes in the canyon
rock where explosives could be placed. One of Frank Crowe’s
famous innovations was put to good use during this part of the
process: Men were able to drill holes simultaneously by using
“drilling jumbos.” These 10-ton (9.1-metric ton) trucks were
modifi ed with three “stories” of planks that allowed 24 to 30
men to drill holes at once at three different heights. A total of
eight drilling jumbos were used at the site and helped to quicken
the pace.
Once holes were drilled, workers used dynamite to blast into
the rock and break it into smaller pieces that could be hauled
away by dump trucks. A ton (.9 metric tons) of dynamite was
required for every 14 feet (4.3 meters) of tunnel that workers
dug into the canyon wall. Before hauling could begin, however,
expert miners checked the tunnels after blasting was complete
to ensure that each newly dug tunnel was safe for other work-
ers to enter. Worker Steve Chubbs described— in Dunar and
McBride’s Building Hoover Dam— what happened next: “They’d
Construction Begins
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THE HOOVER DAM68
bring shovels and the trucks in. They called it muck. Ever hear
the word? It was mostly broken rock. But it was an old word they
picked up someplace. So they used to refer to the hauling out of
the rock as mucking— mucking out. They’d muck out the rock and
haul it away.” Muckers cleared out the pieces of rock using power
shovels and hand tools. Conveyor belts helped speed up the pace
as well by removing rock from the area more quickly. The rock,
once loaded onto dump trucks, was brought to the river’s side
canyons and dumped into piles. This rock was called spoil.
In order to build the Hoover Dam in such a remote location, equipment and
men had to be transported by boat from the Colorado River into Black Canyon.
Rail lines and roads were eventually built, and the river waters were diverted
to allow for large- scale construction. Above, the upstream view of the Hoover
Dam before completion.
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69
A MYSTERIOUS ILLNESS STRIKES
Working on the all- important diversion tunnels was a diffi cult job, but fall-
ing rock was not the only danger the men faced. Workers drove diesel
trucks into the tunnels as they progressed to haul out the newly blasted
rock. Meanwhile, fellow workers breathed in the tunnel air while they com-
pleted their own jobs. Inside the tunnels, fans and pipes circulated the
air, but diesel exhaust remained. In the book Building Hoover Dam, worker
John Gieck described his experience in the tunnels: “On the fi rst of April
1932, I was sent down to the dam to do carpentry, building forms for the
concrete in the [diversion] tunnels. Trucks and tractors working in there,
carbon monoxide. I went to work down there one night, and there was 17
men in [my] crew. The next morning myself and 3 others was all that [was]
left— all the rest was taken out sick.” A number of workers eventually
came down with what company doctors diagnosed as an unusual pneumo-
nia. A few men even died. Workers at the site remained skeptical, however.
They believed that tunnel fumes, not pneumonia, had affected the men.
Six men fi led suit against Six Companies because of their illnesses.
They had worked in the diversion tunnels and believed that their symp-
toms were from carbon monoxide poisoning and may be permanent.
Each worker demanded $75,000 ($1 million today) plus lost wages. Six
Companies refused to budge and, instead of settling out of court, hired
a private investigator. The investigator provided background information
that made each worker look bad when his case went to court. Much like
the attention some trials receive in the media today, the well- publicized
carbon monoxide poisoning cases provided the people of Las Vegas
with hours of entertainment.
As time wore on, more and more men came forward with symptoms.
Although the suspected hazardous fumes were never proven to be the
cause of the workers’ sickness, Six Companies fi nally settled out of court
for an undisclosed amount of money. Yet it may have been better if they had
settled when the cases fi rst arose— instead of settling with only 6 men,
in the end the company had to settle with a total of 50 plaintiffs.
Construction Begins
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the hoover dam70
Lining the tunnelsFrank Crowe was given the nickname “Hurry-Up” Crowe, and for
good reason: He was consumed with deadlines. Thanks to Crowe’s
innovations and inspiration, and his hardworking team of men, the
diversion tunnels were dug out in only 14 months—several months
ahead of schedule. Digging out was just the first step, however.
Before the tunnels would be complete and ready to use, they had
to be lined with a layer of concrete. A concrete mixing plant was
built three-quarters of a mile (1.2 kilometers) from the construc-
tion site specifically for this purpose. Its first batch of concrete
was produced on March 3, 1932. The plant provided the concrete
needed for both the tunnel lining and the dam’s lower levels.
The concrete tunnel lining was created in three stages. The
first stage involved pouring the base, or invert, to place the con-
crete. To accomplish this task, workers used gantry cranes that
ran on rails throughout the entire length of each tunnel. The sec-
ond stage was pouring the sidewalls, which was done by using
moveable sections of steel form. The last stage was filling in the
overheads, which workers accomplished using pneumatic guns.
When it was finished, the concrete lining was 3 feet (0.9 meters)
thick, shrinking each tunnel’s original diameter of 56 feet (17.1
meters) to 50 feet (15.2 meters).
On November 14, 1932, the new tunnels were put to the test
when water flowed through them for the first time. The tunnels
were capable of carrying more than 1.5 million gallons (5.7 mil-
lion liters) of water each second, but this was only the first step.
There was much work to be done, including the construction of a
powerhouse, intake tunnels, and the enormous dam itself.
CofferdamsTo keep the dam’s work site isolated and protected from possible
flooding, two temporary dams, or cofferdams, were among the
project’s many construction plans. Workers made the cofferdams
by using 100 trucks to dump dirt, rock, and debris into the water
71
at a rate of one truckload every 15 seconds. This frenzied pace of
dredging and dumping went on for fi ve months.
The design of the upper cofferdam was such that, if water shot
through the diversion tunnels at a speed of 200,000 cubic feet (6,000
cubic meters) per second, the water would still be 13 feet (4 meters)
below the cofferdam’s crest— thus protecting the work site from
any fl ooding. Engineers used the 200,000- cubic- feet- per- second
By sliding sticks of dynamite into holes bored into the canyon wall, workers
were able to blast and excavate large diversion tunnels. These tunnels, each
about the size of a 4-lane highway, were lined with 3 feet of concrete, allowing
river water to be transported away from the construction site at a rate of 1.5
million gallons per second. Above, workers inside one of the diversion tunnels
in Black Canyon.
Construction Begins
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THE HOOVER DAM72
benchmark because that was the largest fl ow ever recorded at
Black Canyon.
Although the Colorado had not yet been diverted through the
tunnels, workers started on the cofferdams in September 1932.
The upper cofferdam was to be located 600 feet (182.9 meters)
downriver, at the site of the diversion tunnels’ inlets. Again, as
with construction of the dam itself, building of the fi rst coffer-
dam could not begin without the completion of some preparatory
work. In this case, workers had to remove 250,000 cubic yards
(190,000 cubic meters) of silt. When the upper cofferdam was
complete, it stood 98 feet (29.9 meters) high—30 feet (9.1 meters)
beyond the top of the diversion tunnels. Its base was 750 feet
(228.6 meters) thick.
Work on the lower cofferdam was delayed until the high scal-
ing work at the site of the future power plant and outlet works
was complete. When this second temporary dam was fi nished, it
stood 66 feet (20.1 meters) tall, stretched 350 feet (106.7 meters)
across, and had a base 550 feet (167.6 meters) thick. Including
the rock fi ll layer that covered the cofferdam’s downstream side,
230,000 cubic yards (174,800 cubic meters) of earth and an addi-
tional 63,000 cubic yards (47,880 cubic meters) of rock had been
used in the dam’s creation.
Once the cofferdams were ready, the water that rested
between them was pumped out. Then workers began to excavate
the area, using steam shovels to remove 40 feet (12.2 meters) of
rock, sand, and silt from the riverbed.
Because the cofferdams were made of a soft earth fi ll, some
feared that these temporary dams might be damaged if a fl ood
should occur. To further protect these cofferdams and the work
site, a rock barrier 54 feet (16.5 meters) high, 375 feet (114.3
meters) long, and 200 feet (61 meters) wide at the base was
created. It sat 350 feet (106.7 meters) downriver from the two
cofferdams. Finally, the diversion tunnels, cofferdams, and rock
barrier were complete. All of this work was put to the test in the
spring of 1933. With the spring came fl oods, and everyone waited
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73
to see if the work would hold. Fortunately all of the hard work
proved successful, and construction of the dam itself was ready
to begin.
HIGH SCALERSPerhaps one of the toughest and most dangerous jobs one could
have during the years of the Hoover Dam’s construction was
that of high scaler. This job entailed the removal of loose rock
from the canyon walls to ready them for the dam’s construction
by smoothing them over and shaping them. Men used 44-pound
(20-kilogram) jackhammers and dynamite. The trick was to do
this work while suspended by a rope that hung from the top of
the canyon wall. High scalers sat in midair contraptions called
bosun’s chairs and had to have the heavy jackhammers lowered
down to them. Then they would position the jackhammer in
place by hand. Once the needed hole was drilled, the high scaler
placed his dynamite and ignited a blast. Finally, the men used
crowbars (if necessary) to free any loosened rock that clung to
the canyon wall after the blast.
The job’s danger came not only from hanging hundreds of
feet in the air above ground but also from maneuvering among
the air hoses and power lines that shared the airspace above the
work site. Falling rocks and dropped tools posed regular threats
to high scalers— in fact, falling rocks and other objects were the
number-one cause of death among the men who worked on the
Hoover Dam.
A special kind of person was needed to perform such a
demanding and dangerous job. The men who worked as high
scalers came from backgrounds as varied as sailors and circus
acrobats, and some were Native American. A number of high
scalers liked to show off when the bosses were not looking. They
would swing out on their thin ropes and perform stunts for the
men below. These high- profi le workers even competed against
one another, seeing who could swing out the farthest or highest
or who could dream up the most impressive stunt.
Construction Begins
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THE HOOVER DAM74
Constant danger meant that life as a high scaler was not
always fun and games. Louis Fagan, known as “The Human
Pendulum,” often completed unusual tasks as part of his high
scaling job. A crew of men was needed to complete work past a
particularly large boulder that jutted out from the canyon wall.
Twice a day, over the course of several weeks, it was Fagan’s job
to transport each worker along a high wire— an act one might
expect to see at a circus. The man to be transported would wrap
his legs around Fagan’s waist and hold tight to the rope. Then, in
one giant leap, the two men would swing out and over the rocky
obstacle. Fagan would then swing back and ready himself to take
the next man over.
When Bureau of Reclamation engineer Burl R. Rutledge fell
from atop the canyon ridge, high scalers were responsible for
his daring rescue. Oliver Cowan was hard at work, high scaling
25 feet (7.6 meters) below the rim, when he heard Rutledge fall.
Cowan’s immediate reaction was to swing out, where he was able
to grab hold of Rutledge by his leg. Fellow high scaler Arnold
Parks joined in the rescue by swinging over and pinning Rutledge
against the canyon wall. Cowan and Parks were able to hold the
stunned engineer there until someone dropped another line that
the men placed securely around him. Rutledge was then pulled
back to safety.
THE CONCRETE OF HOOVER DAMThe Hoover Dam was indeed special. This dam alone required
almost as much concrete for its construction as did all of the
Bureau of Reclamation’s previous dams combined. On June 6,
1933, building of the actual dam structure began when the fi rst
bucket of concrete was poured into the canyon bottom. Rumors
abound that, of the numerous deaths that occurred during the
dam’s construction, one or more men were buried alive inside
the dam’s massive concrete. Yet, because of the way the concrete
was poured— into individual interlocking blocks— this would
have been nearly impossible.
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75
The Pouring ProcessThe concrete used in the Hoover Dam could not be poured all at
once. Had the dam been built this way, it would have taken 125
years to cool and harden completely. It would also have caused
cracking within the concrete that would compromise the dam’s
integrity. Instead, the dam was built as a series of individual
interlocking columns, with each column formed from a group of
concrete blocks. These blocks varied in size— the smallest were
approximately 25 x 25 feet (7.6 x 7.6 meters), the largest were about
25 x 60 feet (7.6 x 18.3 meters), and both averaged 5 feet (1.5 meters)
in depth. The blocks were made by pouring either 4 or 8 cubic yards
(3 or 6.1 cubic meters) of concrete into bottom dump buckets.
Frank Crowe’s overhead cable system lifted the buckets from
the ground, transported them, and then lowered them to their
proper locations. Nine of these cable systems were used during the
dam’s construction. Five of them were attached to movable tow-
ers and could be used in various places. Once a bucket reached its
destination and was poured into a dam form block, a team of fi ve
or six men called puddlers would stomp on the concrete to ensure
that it contained no air holes. Large blocks increased in size only
2 to 3 inches (5.1 to 7.6 centimeters) at a time, and small blocks
increased in height just 6 inches (15.2 centimeters) at a time. That
meant that death by enveloping concrete was unlikely.
HardeningOne- inch (2.5-centimeter) steel piping helped to cool each con-
crete block. Workers placed these thin- walled pipes inside each
form. For initial cooling, when the concrete was fi rst poured,
river water was used inside the pipes. When this round of cooling
was complete, chilled water sent from a refrigeration plant at the
lower cofferdam fi nished the job.
The pipes did more than just cool the hardening concrete.
Once they were no longer needed for that task, workers used
pneumatic guns to fi ll them with grout, making them an integral
part of the dam’s inner structure.
Construction Begins
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THE HOOVER DAM76
Grout was necessary in another area of the dam’s comple-
tion as well. A potential problem with using individual blocks to
build the dam was that hairline cracks might eventually develop
between them. To combat this problem, the upstream and down-
stream sides of every block were created with grooves that ran
vertically and interlocked. After the blocks cooled, grout was
forced into these joints to make the dam even stronger.
While the Hoover Dam’s vast amounts of concrete were being
poured, inspectors and technicians from the Bureau of Reclama-
tion watched over the process. They checked to make sure that
the concrete cooled at the same rate. They looked for any move-
ment in the giant structure as it went up, and they ensured that
no fi ssures occurred in the concrete through which water might
seep. In Dunar and McBride’s book, worker Steve Chubbs talks
about his role in the process:
I think there were 8 or 10 of us. It was all mapped out for us. We
worked in shifts measuring stress and strain, the temperature
of the concrete. [We] put in strain meters and thermometers in
the concrete according to the specifi cations. Then after they
were in, we had to read them every eight hours for two or three
weeks, so it kept us pretty busy.
The last bucket of concrete was poured on February 6, 1935—
two years ahead of schedule and under budget. Its placement
marked the end of construction on the dam itself. The Hoover
Dam soared into the sky, reaching a fi nal height of 726.5 feet
(221.4 meters). It took a while longer to complete the fi nal fea-
tures of the dam. Six Companies had been given seven years to
complete the entire construction; in an astonishing feat against
time, the entire project was fi nished on March 1, 1936—two
years ahead of schedule.
SPILLWAYSThe spillways located on each side of the dam were built to
protect it from great fl ooding. These spillways keep water from
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77
going over the dam’s top. Their function is much like that of an
overfl ow hole of a bathtub: When bath water reaches a certain
level, it gets sucked into the hole and sent down the drain.
To create room for these two spillways, workers had to exca-
vate more than 600,000 cubic yards (456,000 cubic meters) of rock.
These concrete- lined open channels were built 650 feet (198.1
meters) long, 150 feet (45.7 meters) wide, and 170 feet (51.8 meters)
deep. Their concrete lining measured 18 inches (45.7 centimeters)
thick on the wall sides and 24 inches (61 centimeters) thick on the
Hanging high above ground, workers called high scalers (above) were respon-
sible for removing loose rock from the canyon walls. High scalers endured the
most treacherous work in the dam’s construction: Carrying tools and a large
water bag, they used 44-pound jackhammers to drill dynamite holes into the
canyon walls.
Construction Begins
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THE HOOVER DAM78
bottom. In creating the spillways, workers used a total of 127,000
cubic yards (96,520 cubic meters) of concrete.
The spillways were placed 27 feet (8.2 meters) below the dam’s
top; if any water rose that high, it would fl ow into the spillways
and down the inclined tunnels connected to them. These tunnels
measured 600 feet (182.9 meters) long and 50 feet (15.2 meters)
in diameter, and they were built from the spillway toward the
ground at a steep angle. There, they connected to two of the
original diversion tunnels. The discharge from each spillway was
controlled by a large drum gate at each spillway’s crest. These
gates could be controlled either automatically or manually. The
maximum velocity of the water in the spillways was close to 175
feet per second (53.3 meters per second) or 120 miles per hour
(193.1 kph). At its maximum, the water fl ow over each spillway
would be nearly equal to the fl ow over Niagara Falls!
Since their completion, the spillways have been used only
twice— once in August 1941 to test their function, and once dur-
ing an unusually wet spring in 1983. That year, the spillways per-
formed the job they were created to do. Water fl owed into them
at a rate of 52,000 cubic feet (1,560 cubic meters) per second,
minimizing the fl ooding that occurred downstream.
HYDROELECTRICITY: THE BASICSHydroelectric power is a form of clean energy. It does not cause
air pollution, create chemical leftovers, or produce toxic waste.
To create this electrical energy, water must fall from above
to an area below. The greater the distance the water falls, the
more electrical energy can be produced. The fall of water can
occur naturally, such as the movement of water in a waterfall
or water traveling down the slope of a mountain. Although the
natural fall of water can produce electrical energy, it is not
necessarily the best way to produce it. Such sources, when they
occur in nature, are not always reliable. When weather is dry
and little rain falls, there may not be enough water to create the
energy needed.
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79
This is where dams come in. A dam can store water, guar-
anteeing that there will be enough to create energy on a regular
basis. Using a dam, a plant can be built in a location that has no
natural fall of water. The dam and plant work together to create
the electrical energy. First, the dam holds back enough water
to cause the water level to reach a high point, or head. Next,
the water is released so that it falls with force; this is the force
of gravity at work. Finally, this water hits the blades of water
wheels below. These spinning turbines use mechanical energy to
turn a power generator. The generator then takes the mechanical
energy and turns it into electrical energy, or electricity.
Niagara Falls, New York, boasts the site of the fi rst hydroelec-
tric station ever built. Completed in November 1896, the plant
provided electricity for the city of Buffalo, New York, 20 miles
(32.2 kilometers) away. From that date in the late 1800s to the
year 1977, hydroelectric power plants grew by leaps and bounds.
In 1977, hydroelectric stations were responsible for producing
almost one-third of all the electrical power in the world.
A Generator’s PartsA generator, like the 17 found in the Hoover plant, has fi ve main
parts. The fi rst is called the exciter. The exciter is a much smaller
generator that produces electricity sent to the rotor— one of the
other main parts— and charges it magnetically. The rotor con-
sists of a series of electromagnets known as poles, which are
connected to another of the fi ve major parts— the shaft. When
the shaft rotates, the rotor does as well. The shaft connects both
the exciter and the rotor to the turbine. The last major compo-
nent of the generator is called the stator. This crucial piece is a
nonmoving copper wire coil. Electricity is made when the rotor’s
magnets spin past the copper wiring of the stator.
THE HOOVER POWER PLANTAt the foot of the Hoover Dam is its own U- shaped power plant.
The plant houses 17 generators that together produce more
Construction Begins
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THE HOOVER DAM80
than 4 billion kilowatt- hours each year— enough for 1.3 million
people. (A kilowatt- hour is the unit of work or energy equivalent
to that done by one kilowatt of power acting for one hour. One
kilowatt equals 1,000 watts or 1.34 horsepower.)
The power plant has two wings, each of which measures
650 feet (198.1 meters) in length. Inside each of these wings are
two station- service units powered by giant water wheels. Each
station- service unit generates 2,400 kilowatts of electricity. This
energy is used to help run the plant itself, powering its lights as
well as the cranes, pumps, motors, compressors, and other elec-
trical equipment necessary for both the dam and the plant.
Part of the original appeal of the Hoover Dam was that the
energy it produced would eventually help pay for its initial cost.
In 1940, the Boulder Canyon Project Act passed. Using this legis-
lation, the secretary of the interior could decide what to charge
THE HARD- BOILED HAT
The danger of debris falling from above led to another innovation in
construction— the hard hat. The Hoover Dam construction site is
believed to be the fi rst place this protective gear was put into use. Work-
ers, hoping to protect themselves from falling rock and other debris,
cleverly took two caps and placed them one on top of the other, with
the bills facing in opposite directions. They dipped these double- billed
hats in tar, let them harden, and then repeated the process several
more times. It did not take long for word to spread about how these
makeshift hardhats had saved several men from what might have been
deadly accidents. A few men were hit so hard by falling rocks that their
jaws were broken; however, because they had their hard hats on, they
did not receive skull fractures. Six Companies put in an order for these
new hardhats and purchased them for every man on the job. The result
was a marked reduction in the number of deaths that occurred.
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81
for the energy created by the plant and determine how the money
that was generated should be spent. By May 31, 1987, the goal was
achieved: The energy produced and sold by this time paid for the
project’s original construction costs.
Southern California Edison and Los Angeles Water and Power
were responsible for running the plant, under the supervision of
the Bureau of Reclamation, until 1987—the year their 50-year
electric service contracts expired. From that time forward,
the Bureau of Reclamation took over the plant’s operation and
maintenance.
Over time, changes have been necessary at the plant site. In
1984, Congress passed the Hoover Power Plant Act. This act pro-
vided for upgrades to the 17 generators as well as the construc-
tion of additional visitor facilities and the Hoover Dam Bypass
Bridge. As a result of this legislation, all 17 of the original genera-
tors were replaced between 1986 and 1993.
The Hoover Power Plant has been a great success. Between
1939 and 1949, it was the largest such plant in the United States.
In recent years, however, its electricity- generating capacity has
diminished due to continuing drought conditions and lower res-
ervoir levels.
INTAKE TOWERSWhile the dam’s concrete was being poured, four signifi cant
structures were being built above the dam itself. These are the
dam’s intake towers. Each comprises 93,674 cubic yards (71,192
cubic meters) of concrete and 15.3 pounds (6.9 kilograms) of steel.
Each structure is 82 feet (25 meters) wide at the base, a little over
63 feet (19.2 meters) in diameter at the top, and between 29 and
30 feet (8.8 and 9.1 meters) in interior diameter. Each of these
four units is responsible for supplying one- fourth of the water the
turbines need to create electricity.
The four intake towers— two on the Arizona side and two
on the Nevada side— control the amount of water fl owing
through them by two cylindrical gates. These gates are located
Construction Begins
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the hoover dam�2
near the middle and bottom of each tower and are protected
by sturdy trash racks that weigh 7 million pounds (3.1 million
kilograms) each.
PenstoCksAt the Hoover Dam, water reaches the turbines by way of four
30-foot (9.1-meter) diameter penstocks—two on each side of the
river—that connect the intake towers to the power plant and out-
let valves. An entire fabrication facility was needed at the dam
site to create the penstocks. They were put together using sepa-
In order to deliver concrete to the work areas without exhausting his
employees, Frank Crowe designed an elaborate cable system to transport
materials throughout the work site. With this system, construction became
faster and more efficient as buckets full of concrete reached workers every
78 seconds. Above, a crane lifts a load of concrete to workers on the
canyon wall.
�3
rate 11-foot (3.4-meter) sections that weighed 80 tons (72.6 metric
tons) each. Two of these smaller sections were joined to make
one 22-foot (6.7-meter) piece that was then moved to the canyon
rim by tractor. Next, the largest of Frank Crowe’s cableways car-
ried this 160-ton (145.2–metric ton) section to the canyon base,
where sections were joined together until they formed 1 mile (1.6
kilometers) of connected pipe.
Water is sent through the penstocks via special gates that
control the amount that passes through. The minimum head, or
vertical distance the water travels downward, is 420 feet (128
meters), and the maximum is 590 feet (179.8 meters). On average,
the head is 510 to 530 feet (155.4 to 161.5 meters).
the dIversIon tunneLs transFormWhen the diversion tunnels were no longer needed to reroute the
Colorado River around the dam site, they were partially filled with
concrete and used for another purpose. The two inner tunnels
were each filled up to one-third of their length below the inlets.
The 30-foot (9.1-meter) diameter steel pipes would now connect
the reservoir’s intake towers to both the power plant’s penstocks
and the canyon wall outlet works. Located at the outlets of the
two inner tunnels are 50-x-35-foot (15.2-x-10.7-meter) gates. Each
gate can be closed whenever necessary—for example, when the
tunnels need to be emptied for inspection or repair work.
The outer tunnels were filled for half of their length. The
two open downstream halves now could be used as spillway
outlets. Gigantic 50-x-50-foot (15.2-x-15.2-meter) steel bulk-
head gates permanently shut the inlets of the two outer tun-
nels. Each gate weighed an unbelievable 3 million pounds
(1.35 million kilograms) and had to be transported to the site
by 42 railroad cars.
the hoover dam reservoIrThe water held back by the immense dam created the largest
human-made reservoir in the world—Lake Mead—in one of the
Construction Begins
THE HOOVER DAM84
driest places on Earth. The only real way to test the dam was to
fi ll its reservoir, a task that took six years.
Lake Mead spans 157,900 acres (63,160 hectares) or 247
square miles (642.2 square kilometers). It extends 110 miles
(177 kilometers) upstream toward the Grand Canyon as well
as 35 miles (56.3 kilometers) up the Virgin River. The width
of the lake varies depending on its location. In the canyons,
it can stretch anywhere from several hundred feet to 8 miles
(12.9 kilometers). With a normal elevation of 1,221 feet (372.2
meters), the Hoover Dam’s reservoir can hold 28.5 million acre-
feet (3.4 million cubic meters) of water. (An acre- foot equals the
amount of water needed to cover one acre, or 0.4 hectares, of
area at a depth of one foot, or 0.3 meters.) One acre- foot equals
about 326,000 gallons (1.2 million liters). The amount of water
in Lake Mead could cover the entire state of Pennsylvania up to
1 foot (.3 meters).
THE DEDICATION OF THE HOOVER DAMAfter the fi nal concrete was poured, President Franklin D. Roo se-
velt came to the site on September 30, 1935 to speak at its dedica-
tion ceremony. Among his remarks, Roosevelt said,
Ten years ago the place where we are gathered was an unpeo-
pled, forbidding desert. In the bottom of a gloomy canyon,
whose precipitous walls rose to a height of more than a thou-
sand feet, fl owed a turbulent, dangerous river. The mountains
on either side of the canyon were diffi cult to access with neither
road nor trail, and their rocks were protected by neither trees
nor grass from the blazing heat of the sun. The site of Boulder
City was a cactus- covered waste. The transformation wrought
here in these years is a twentieth- century marvel.
He ended his speech with the words, “This is an engineer-
ing victory of the fi rst order— another great achievement of
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85
American resourcefulness, American skill and determination.
That is why I have the right once more to congratulate you who
have built Boulder Dam and on behalf of the Nation to say to
you, ‘Well done.’”
Construction Begins
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86
CHAPTER 6
Dams in the World Today
The Hoover Dam’s construction was seen as progress in the
1930s and for several decades dam building continued at a
good pace. With time, however, people began to realize that dams
had drawbacks as well as benefi ts. In today’s world, dam construc-
tion can be fi lled with controversy, and there are even movements
to promote the tearing down of these human- made structures.
But given the millions of people who travel to see it from around
the world, there can certainly be no doubt that Hoover Dam has
become, and will remain, an iconic feat of engineering.
THE DEBATE ON DAMSA great deal of controversy currently surrounds the subject of
dams. In fact, there are even disagreements about the number
of new dams being constructed in the world today. Some envi-
ronmental organizations claim that the number of new dams is
decreasing. The Sierra Club says that dams in the modern world
are “falling like dominoes in the name of river restoration.” How-
ever, the United States Committee on Large Dams says that, if
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87Dams in the World Today
you look at the number of dams being built worldwide— rather
than just in the United States— the 36,000 dams currently in use
are ever increasing. As populations continue to grow, the com-
mittee claims, more dams will be necessary to keep up with the
demand for water.
From the 1930s to the 1970s, dam construction was equated
with modernization and economic progress. Dam building
reached its peak in the 1970s, when it is estimated that around
the world two or three large dams were in early planning stages
each day. Over time, more information became available about
how these dams affected the surrounding people and environ-
ment. Part of their impact includes an estimated displacement of
anywhere from 40 to 80 million people worldwide.
Dams and their diversion of a river’s natural fl ow have
affected approximately 60 percent of the world’s rivers. Dams
have obvious benefi ts— providing drinking water, fl ood protec-
tion, and water for irrigation chief among them. Yet, dams—
especially large ones— have drawbacks as well. Today, people
debate whether dams are helpful or harmful.
Dam Benefi tsBenefi ts of large dams go beyond fl ood control, irrigation, and
the creation of recreational lakes. For example, dams can help
with soil conservation. It is probably obvious that a fl ood can
ruin crops. What may be less obvious is that a fl ood can actually
destroy the land for future use by carrying away the rich topsoil
needed to nourish and grow a crop. By preventing fl oods in the
fi rst place, dams ensure that soil will be protected.
In the United States today, there are more than 2,000 dams
with hydropower plants at their base. A further benefi t of large
dams is the hydropower produced by these plants. Currently, this
hydroelectric power is the most plentiful and effi cient source
of renewable energy— hydropower provides 90 percent of all
renewable electrical energy in the nation. The energy produced
at hydropower plants is much cleaner than the energy that comes
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THE HOOVER DAM88
from fossil fuels, which results in less air pollution. According to
the United States Society on Dams, if all of today’s hydropower
energy were produced using coal, pollution from coal would
increase 16 percent.
Dam DrawbacksA major concern of environmental groups, such as the Sierra
Club, is the possible extinction of plants and animals native to a
dam’s environment. The Sierra Club states that dams “devastate
fi sh runs and destroy fragile ecosystems.” Reservoirs, once fi lled,
can cover entire forests, and areas where dams are built may
also lose wetlands and farmlands as a result. In certain places,
dams have caused the extinction of some fi sh and other aquatic
creatures. In addition, birds may leave the vicinity when forests
are no longer present.
THE STORY OF MISS VEGAS
These days, the Hoover Dam hosts millions of curious visitors each year.
But way back in the summer of 1930, a man named P. Leonard Lacey
was the fi rst to capitalize on the tourist trade that such a feat of engi-
neering could bring. Lacey, the operator of a small boat service in the
area, built the Boulder Dam Pier on the Colorado River. On this two- story
boat landing, tourists could board boats and see the sights of Black
Canyon. The fi rst of Lacey’s water vessels was an open, 33-foot (10.1-
meter) boat that could seat 42 sightseers. Its name was Miss Vegas.
Miss Vegas did not have a very long run. For less than a year, she
took couples on romantic moonlight cruises into the dark canyon and
chartered government engineers and offi cials who needed to make
last- minute inspections before the dam’s construction began. Her excur-
sions came to an end in the spring of 1931, when Lacey’s giant pier had
to be demolished to clear the way for a government railroad. Lacey sold
Miss Vegas to none other than Six Companies, which used the boat to
carry equipment and workers during the dam’s construction.
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89
Another drawback of constructing a new dam is that some-
times people— even entire towns— need to be relocated to make
way for the project. In March 1997, people from 20 countries
including Argentina, Chile, China, India, Russia, Thailand, and
the United States gathered in Curitiba, Brazil, for the First Inter-
national Meeting of People Affected by Dams. On March 14, they
made a declaration “affi rming the right to life and livelihood of
people affected by dams.” The fi rst few paragraphs of the decla-
ration read as follows:
We, the people from 20 countries gathered in Curitiba, Brazil,
representing organizations of dam- affected people and of oppo-
nents of destructive dams, have shared our experiences of the
losses we have suffered and the threats we face because of dams.
Although our experiences refl ect our diverse cultural, social,
political and environmental realities, our struggles are one.
Our struggles are one because everywhere dams force
people from their homes, submerge fertile farmlands, forests
and sacred places, destroy fi sheries and supplies of clean water,
and cause the social and cultural disintegration and economic
impoverishment of our communities.
Our struggles are one because everywhere there is a wide
gulf between the economic and social benefi ts promised by dam
builders and the reality of what has happened after dam construc-
tion. Dams have almost always cost more than was projected,
even before including environmental and social costs. Dams
have produced less electricity and irrigated less land than was
promised. They have made fl oods even more destructive. Dams
have benefi ted large landholders, agribusiness corporations and
speculators. They have dispossessed small farmers; rural work-
ers; fi shers; tribal, indigenous and traditional communities.
The World Commission on DamsIn response to the increasing debate on dams— especially large
ones— a commission of 12 members was established in Febru-
ary 1998. The World Commission on Dams had two main goals.
Dams in the World Today
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THE HOOVER DAM90
Holding back the waters of the newly formed Lake Mead, the Hoover Dam was
unveiled to the public in 1935—earlier than expected and millions of dollars
under budget. During the dam’s dedication ceremony, President Franklin Del-
ano Roosevelt surveyed the structure, and announced, “I came, I saw, I was
conquered.” Above, the dedication ceremony gave people a chance to admire
the dam for the fi rst time.
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91
The fi rst goal was to review the effectiveness of large dams and
to suggest alternatives for the water resources and energy that
such dams provide. The second objective was to develop guide-
lines and standards to be used globally in the planning, design,
construction, operation, maintenance, and removal of dams.
In its report “Dams and Development: A New Framework for
Decision- Making” released on November 16, 2000, the commission
began by stating, “The global debate about large dams is at once
overwhelmingly complex and fundamentally simple.” It claimed
that dams had made an important and signifi cant contribution to
society’s progress, but the commission also acknowledged that
this progress had come at a price— such as displaced communi-
ties, higher taxes, and interference with the natural environment.
TEARING DOWN DAMSAlthough some countries, such as China, continue with the con-
struction of large- scale dam projects, the commissioning of large
dams in the United States has come to a standstill. In fact, pressure
is mounting— mainly from environmental organizations— to tear
down a number of large dams across the country. One of the fi rst
big dams to come down in the United States was North Carolina’s
Quaker Neck Dam, located on the Neuse River. The dam’s tear-
down was an attempt to save fi sheries and renew the river. Once
Quaker Neck was dismantled, 75 miles (120.7 kilometers) of river
and 90 miles (144.8 kilometers) of tributaries were reopened.
DAM FAILURES AND DISASTERSBecause of the potential destruction that dam failures can cause,
they often receive a large amount of publicity. Yet the overall
incidence of dam failures is low when the number of dams in
existence is taken into consideration. Following are a few dam
failures and disasters that made the papers— and history.
Vaiont, ItalyTragedy struck the town of Vaiont, Italy, on October 9, 1963.
That day, rock and earth moved down the mountainside when
Dams in the World Today
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the hoover dam92
the weight of the Vaiont Dam’s own reservoir water caused a
landslide. The spillage into the reservoir in turn caused a great
wave of water to rush over the dam wall into the valley below. It
was a testament to the dam’s strength and construction that, in a
fl ood of water that killed more than 2,000 individuals and ruined
several villages, the dam itself remained remarkably intact and
was kept in use until 1977.
teton damIn 1976, the Teton Dam— an earthfi ll embankment dam in
Idaho— had just been built, and the dam’s reservoir was fi lling
After thorough studies, approval was given for teardown of the
Edwards Dam— an actual timber crib, which means that it is a log
structure fi lled with rocks and capped with concrete. The removal took
place in two stages in the summer of 1999. The fi rst stage involved
the building of a large cofferdam that stretched from the west shore to
the dam itself. Once this cofferdam was in place, workers excavated
90 feet (27.4 meters) of the dam. After the excavation was fi nished,
they breached— or made a gap in— the cofferdam, which allowed the
reservoir to lower its level 8 feet (2.4 meters).
The second stage of the teardown involved the same process, this
time using a smaller cofferdam on the dam’s east side. Here, 300 feet
(91.4 meters) of the dam was removed. The smaller cofferdam was
then breached, and the reservoir lowered the rest of the way. The 17
miles (27.4 kilometers) of river now fl ow their natural course and will
once again provide a home for endangered fi sh species such as short-
nosed and Atlantic sturgeon, striped bass, shad, and alewife.
TearinG DoWn eDWarDs Dam
Amid the increasing debate over dams, some dams are being removed
for a variety of reasons. The Edwards Dam in Augusta, Maine, con-
cerned local residents. The hydropower it produced only provided 0.1%
of the state’s total power, and this small amount did not seem to out-
weigh the damage done to fi sh migration and passage.
Before the dam could be removed, a lot had to be considered. For
example, before the project could be approved, offi cials had to know
the answer to the following question: When the reservoir was lowered,
would it cause the steep embankments to cave into the river? Such
an event could result in devastating mudslides and peoples’ homes
falling into the river. To answer this and other questions, the Federal
Energy Regulatory Commission hired several companies to investigate
the river system, the environmental impact of the dam’s removal, and
the total cost of such a project.
Building America Now
93
with water. On June 5, someone spotted a hole in the dam’s 300-
foot (91.4-meter) wall, through which water was leaking. Because
of this observer’s keen eye, people were warned in advance of
the dam’s possible failure, and most people located below the
dam moved to safety before it burst. The advance warning had
come early enough that a television crew was able to set up and
fi lm the dam the moment it ruptured. The Teton Dam’s failure
resulted in the fl ooding of two cities— Sugar City and Reburg.
Despite the early warning provided, 14 people were killed and
the torrent of water and sand caused more than a billion dollars’
worth of damage.
Dams in the World Today
After thorough studies, approval was given for teardown of the
Edwards Dam— an actual timber crib, which means that it is a log
structure fi lled with rocks and capped with concrete. The removal took
place in two stages in the summer of 1999. The fi rst stage involved
the building of a large cofferdam that stretched from the west shore to
the dam itself. Once this cofferdam was in place, workers excavated
90 feet (27.4 meters) of the dam. After the excavation was fi nished,
they breached— or made a gap in— the cofferdam, which allowed the
reservoir to lower its level 8 feet (2.4 meters).
The second stage of the teardown involved the same process, this
time using a smaller cofferdam on the dam’s east side. Here, 300 feet
(91.4 meters) of the dam was removed. The smaller cofferdam was
then breached, and the reservoir lowered the rest of the way. The 17
miles (27.4 kilometers) of river now fl ow their natural course and will
once again provide a home for endangered fi sh species such as short-
nosed and Atlantic sturgeon, striped bass, shad, and alewife.
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THE HOOVER DAM94
Other FailuresAn earth dam in western India collapsed under pressure from
fl oodwaters. The incident, which occurred in 1979, killed 5,000
people; numerous others lost their homes. Perhaps the worst
disaster in the history of dams was a failure in Philadelphia,
Pennsylvania, in 1889. When the dam burst, it not only crushed
houses by the hundreds, it also killed a total of 10,000 people.
HOOVER DAM TODAYThe Hoover Dam is now run by the Lower Colorado Dams Offi ce
of the Bureau of Reclamation. In addition to managing, operat-
ing, and maintaining America’s most famous dam, this Reclama-
tion Offi ce runs other dams on the Lower Colorado, such as the
Davis and Parker dams.
Visiting Hoover DamHoover Dam has been a popular tourist spot since its comple-
tion. Every year, nearly one million visitors come to the famous
dam and participate in the Bureau of Reclamation’s guided tour
program. Visitors initially could take part in a hard hat tour that
took place inside the power plant, but that tour has since been
replaced by a primarily self- guided “Discovery Tour.” With a
ticket, visitors have access to the Visitor Center and a variety of
dam exhibits. At several locations, staff members still provide
informational talks. The Bureau of Reclamation estimates that a
full tour of Hoover Dam, seeing everything there is to see, should
take a visitor about two hours.
So, what can people do on their visit? Several displays—
including murals, maps, and photos—provide a thorough intro-
duction to the famous dam’s history. Another exciting option is
to take an elevator 500 feet (152.4 meters) down, right into the
rock wall of Black Canyon. Once there, visitors walk through a
250- foot- long (76.2- meter- long) corridor that has been drilled out
of the surrounding rock. At the end of this rock tunnel, tourists
can take in the Nevada wing’s 650- foot- long (198.1- meter- long)
section of the power plant, along with its eight gigantic generators.
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95
Visitors who want to see still more of the dam can perch themselves
on the dam’s penstock viewing platform. From here, they can view
one of the large penstock pipes that carries voluminous amounts
of water from Lake Mead to the power house’s generators.
In the Visitor Center, guests can find many exhibits that
explain how the dam was built and how it works. One of the
newer exhibits, dedicated in 1996, is called “The Bronze Tur-
bine.” This exhibit, designed by Kevin Mills and created by
Lauri Slenning, is an arrangement of seven bronze relief panels.
Matching the dam and power plant’s original art deco style,
each one depicts the benefits the famous dam has brought to
the West.
Lake meadLake Mead is now a part of the Lake Mead National Recreation
Area that is run by the National Park Service. Lake Mohave,
located downstream from the dam, is also a part of the national
recreation area. Attracting more than 9 million visitors each
year, the Hoover Dam’s reservoir has become one of the most
popular vacation and recreation areas in the country, catering to
boaters, swimmers, fishing enthusiasts, and sunbathers alike.
THe ConTroversy over CHina’s THree GorGes Dam
China is currently in the midst of constructing what will be the world’s
largest dam once it is completed in 2009. This gravity dam will stretch
1 mile (1.6 kilometers) across and reach a height of 600 feet (182.9
meters). Set on the Yangtze River, the Three Gorges Dam, according to
Chinese officials, will lessen devastating flooding and (through its hydro-
electric power) greatly reduce the pollution currently produced by coal
use. Those who oppose the dam’s construction, however, point to the
2 million people it will displace as well as the 1,208 historic sites that
will be flooded over by the dam’s reservoir.
dams in the World today
THE HOOVER DAM96
In addition, it continues to serve as a water supply to the
western United States and as the source of power for the hydro-
power plant that serves hundreds of thousands of people. A
visitor to Disneyland in Anaheim, California, or a tourist at Sea
World in San Diego, California, who drinks from a fountain at
either park is actually drinking water from the Colorado River
and Lake Mead, 300 miles (482.8 kilometers) away.
The Hoover Bypass ProjectUnited States Highway 93 crosses right over the top of the
Hoover Dam and is the shortest route from Las Vegas to eastern
locations. This road is also part of the North American Free
When they were completed, the Hoover Dam and Lake Mead (above) became
two of the most popular tourist attractions in the United States. Standing tall
as the eighteenth-highest dam in the world, about 2,000 to 3,000 people visit
this engineering wonder every day.
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97
Trade Agreement route, which means that it is one of the main
commercial routes between Canada and Mexico. It is also the
main commercial route between the states of Arizona, Nevada,
and Utah. This bypass carries a busy 18,200 vehicles each day—
twice the number that it carried 15 years ago.
Traveling on this road is often slow due to traffi c congestion
and the narrow and curvy roads that make it diffi cult to navigate.
In some spots the road also does not have much of a shoulder,
which can pose problems when accidents occur or vehicles break
down. The portion of highway near and over the Hoover Dam is
potentially dangerous. The sharp curves mean that drivers can-
not always see upcoming traffi c congestion and may not have
enough time to stop to prevent hitting the car in front of them.
The solution to this problem is known as the Hoover Dam
Bypass Project. Work on the project’s design began in August
2001, and construction is projected to fi nish in 2010 at a total cost
of $240 million. The current road over the dam will remain open
while the construction of a new bridge progresses. Once the new
bridge is complete, the old road will be used only for dam and
Bureau of Reclamation facilities access— not through traffi c.
The bridge should prove to be a much easier and quicker
route, partly because security checkpoints to ensure the dam’s
safety will no longer be needed for crossing. Currently, motorists
who travel over the dam must stop for vehicle inspections when
approaching the dam from either side of U.S. Highway 93. One
checkpoint in Nevada lies just 1 mile (1.6 kilometers) north of the
dam, and the other checkpoint is located in Arizona, 9 miles (14.5
kilometers) south of the dam.
Because of the dam’s immense size, there really is no good
way to take a photograph of its front without boarding a helicop-
ter. This situation will change, however, once the Bypass Project
is complete. The new bridge spanning the Colorado will provide
one of the most scenic photographic sites in the United States
and a perfect view of this great dam that encompasses a nation’s
technological advancement and strong human spirit.
Dams in the World Today
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ChronoLogy
98
1776 Spanish priest Francisco Garcés gives the Colorado
River its name.
1857 Lieutenant Joseph C. Ives is charged with the job of
traveling the Colorado to determine its potential as a
shipping route.
1901 People make the first attempt to control the Colorado by
diverting its flow; the attempt fails in 1905 when a great
flood occurs.
1902 Arthur Powell Davis conceives the idea for a great dam
on the Colorado River.
1902Arthur Powell Davis conceives the idea for a great dam on the Colorado River
July The U.S. Reclamation Service is estab-lished in accordance with the Reclamation Act
1922November 24 Six states sign
the Colorado River Compact, finally putting an end to years
of disagreement over water rights and usage in the West
1902
tImeLIne1929 June President Hoover signs a proclamation that makes the Boulder Can-yon Project Act effective and paves the way for the construction of the Hoover Dam
1930September 17 Secretary of the Interior Ray Lyman
Wilbur announces that the Boulder Dam will now be
renamed Hoover Dam
1930
99
1902 June 17 Congress passes the Reclamation Act to help
with water resource issues in the West.
July The U.S. Reclamation Service is established in
accordance with the Reclamation Act.
1921 January Walker Young leads a Reclamation Service
team as part of an official program to test the potential
of damming the Colorado.
1922 November 24 Six states sign the Colorado River Com-
pact, finally putting an end to years of disagreement
over water rights and usage in the West.
Congress orders a study on the possible development of
the Colorado Basin area.
Chronology
1933June 6 Building of the actual dam structure begins when the first bucket of concrete is poured
1931March 4 The Bureau of Reclamation awards Six Companies the contract to build the Hoover Dam
May 12 Work on the diversion tunnels begins
1987May 31 The energy produced at the
Hoover Dam power plant and sold fully pays for the project’s original construction costs
1931 1987
1936March 1 The Hoover Dam project is officially complete
THE HOOVER DAM100
1923 The U.S. Reclamation Service is renamed the Bureau of
Reclamation.
The Boulder Canyon Project Act is fi rst introduced in
Congress.
1928 December The Swing- Johnson bill passes in Congress
and is signed into law by President Calvin Coolidge.
1929 June 25 President Herbert Hoover signs a procla-
mation that makes the Boulder Canyon Project Act
effective and paves the way for the construction of the
Hoover Dam.
1930 September 17 Secretary of the Interior Ray Lyman
Wilbur announces that the Boulder Dam will now be
renamed Hoover Dam.
1931 February 19 Six Companies, the unique group of
former individual businesses, becomes an offi cial
corporation.
March 4 The Bureau of Reclamation awards Six Com-
panies the contract to build the Hoover Dam.
May 12 Work on the diversion tunnels begins.
1932 September Work begins on the cofferdams that will
protect the dam site from possible fl ooding during
construction.
November 14 The Colorado River is successfully
rerouted around the work site through the diversion
tunnels.
1933 May 8 New secretary of the interior Harold Ickes
announces that the name of the Hoover Dam will revert
back to Boulder Dam.
June 6 Building of the actual dam structure begins
when the fi rst bucket of concrete is poured.
1935 February 6 The Hoover Dam’s fi nal bucket of con-
crete is poured.
1936 March 1 The Hoover Dam project is offi cially
complete.
1941 August The spillways are tested successfully.
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101
1947 March–April House Resolution 140 is introduced,
passes in Congress, and is signed by President Truman,
changing the great dam’s name one fi nal time to Hoover
Dam.
1983 Spring The spillways reduce downstream fl ooding
during an unusually wet season.
1984 Congress passes the Hoover Power Plant Act, which
allows for the construction of additional visitor facili-
ties and the Hoover Dam Bypass Bridge.
1987 May 31 The energy produced at the Hoover Dam
power plant and then sold has fully paid for the project’s
original construction costs.
Chronology
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102
gLossarybuttress A support for large structures that props up a wall
from its side.
cement A mixture to which water is added that hardens like
rock.
divert To make something go in a different direction.
embankment A bank of earth and rock with a flat top and slop-
ing sides.
engineer A person who designs and builds complicated struc-
tures or machines.
erosion The process of earth elements, such as wind or water,
gradually wearing away a structure.
gravity The natural force that pulls all things to each other.
grout A paste-like mixture used to fill in spaces that hardens
after it is applied.
hydroelectric power Power for electricity produced by falling or
flowing water and a turbine.
intake towers Tall towers behind a dam that act as a drain.
kilowatt-hours Units of work or energy equivalent to that done
by one kilowatt of power acting for one hour; one kilowatt
equals 1,000 watts or 1.34 horsepower.
reservoir A non-natural lake created behind a dam.
silt Extremely fine soil carried down a river that settles at its
mouth.
spillways Chutes designed to safely allow excess water from a
reservoir to flow over or around a dam.
tributaries Streams that flow into a larger river.
turbine A mechanical wheel that uses energy from water or
steam to turn a shaft or axle.
103
“3,000- Year- Old Dam Revives Farming in Turkish Village.” Stone
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archives/002192.html.
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Billington, David P., and Donald C. Jackson. Big Dams of the
New Deal Era: A Confl uence of Engineering and Politics.
Norman: University of Oklahoma Press, 2006.
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Cappato, Jorge. “The International Demand Against Dams Is
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103
BIBLIOGRAPHY
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THE HOOVER DAM104
“Crossing Hoover Dam: A Guide for Motorists.” Bureau of Rec-
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“Frequently Asked Questions: Lake Mead.” Bureau of Reclama-
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ways.” Bureau of Reclamation: Lower Colorado Region.
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frontviews.html.
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damfaqs.html.
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THE HOOVER DAM106
Hunt, Bernice Kohn. Dams: Water Tamers of the World. New
York: Parents’ Magazine Press, 1977.
Jackson, Donald C. Building the Ultimate Dam: John S. East-
wood & the Control of Water in the West. Lawrence: Univer-
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McBride, Dennis. “Boulder City History: Miss Vegas.” Boulder
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McCarney, Kerry J. “Saluda Dam Remediation.” The Geological
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McDonagh, Gavin. “The Dam Dilemma.” Riverdeep. http://www.
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Oxlade, Chris. Dams, 2nd ed. (Building Amazing Structures).
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THE HOOVER DAM108
World Commission on Dams. Dams and Development: A New
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109
BOOKSBarter, James. The Colorado (Rivers of the World). Farmington
Hills, MI: Lucent Books, 2003.
Dunar, Andrew J., and Dennis McBride. Building Hoover
Dam: An Oral History of the Great Depression. New York:
Twayne Publishers, 1993.
Dutemple, Lesley A. The Hoover Dam (Great Building Feats).
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WEB SITESThe Boulder City/Hoover Dam Museum
http://www.bcmha.org
Building Big: Dams
http://www.pbs.org/wgbh/buildingbig/dam/index.html
Geoguide: Dams!
http://www.nationalgeographic.com/geoguide/dams
Herbert Hoover Presidential Library and Museum: Hoover Online!
http://www.ecommcode.com/hoover/hooveronline/hoover_dam/
toc.html
109
FURTHER RESOURCES
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THE HOOVER DAM110
Nevada History: A Walk in the Past— The Boulder Canyon Project
AKA Hoover Dam
http://www.nevada- history.org/boulder_canyon_project.html
University of Las Vegas Libraries Digital Projects: Hoover Dam
http://www.library.unlv.edu/early_las_vegas/hoover_dam/
hoover_dam.html
VIDEOSAmerican Experience: Hoover Dam [DVD], WGBH Boston,
2006.
Modern Marvels: Hoover Dam [DVD], A&E Television Net-
works, 1999.
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111
PICTURE CREDITSPAGE:
8 Las Vegas Sun, Aaron
Mayes, AP Images
13 Taylor S. Kennedy /
National Geographic /
Getty Images
22 Library of Congress,
ppmsca 10032
27 Library of Congress,
ppmsca 17315
29 The Granger Collection,
New York
34 Library of Congress, cph
3b14076
39 © Bettmann / Corbis
44 Library of Congress,
LC- USZ62- 74384
55 Union Pacifi c Museum,
University of Nevada,
Las Vegas, Special
Collection
57 © Bettmann / Corbis
61 AP Images
68 AP Images
71 AP Images
77 © Bettmann / Corbis
82 Library of Congress
ppmsca 17340
90 AP Images
96 © Ron Chapple / Corbis
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INDEX
112
AAfrican Americans 63–64Alacahoyuk, Turkey 14All- American Canal 42American Experience: Hoover
Dam (PBS fi lm/Web site) 43, 45, 51–52, 53, 62
American Society of Civil Engineers 21
Anderson Brothers, mess hall of 56, 62
arch dams 16, 17, 19Arizona 41Arrowrock Dam (Idaho) 30,
37, 54
Bbackup dam 21beavers as dam builders 11Bechtel, Warren A. 50Bechtel, William 64benefi ts of dams 87, 88Big Bend Dam (S. Dakota) 30Big Dig, the 46–47Black Canyon 9, 23, 43, 95
as dam site choice 29, 38, 42, 43, 48
living area in 52, 53, 54Black Canyon Project 49Boston, Massachusetts 46–47Boulder Canyon 31, 42Boulder Canyon Project 31,
37, 42Boulder Canyon Project Act 42,
43, 45, 48, 80Boulder City 60–63, 84
as lasting temporary town 62–63
segregation and 64
services/benefi ts in 61, 62
Boulder Dam 32, 85name change and 34, 45as offi cial dam name 42spending authorization
for 42Boulder Dam Pier 88Boyds Corner gravity dam 18bridge construction 97Buffalo, New York 79Building Hoover Dam: An
Oral History of the Great
Depression (Dunar and McBride) 31, 38, 58, 59, 60, 67–68, 69, 76
Bureau of Reclamation. See U.S. Bureau of Reclamation
buttress dams 17, 18–19
CCalifornia 32, 34, 35–36, 96Canton, Georgia 52canyon ridge 74carbon monoxide poisoning
58, 69cement 16, 55. See also
concreteCentral Artery/Tunnel project
(CA/T) 46–47China 91, 95Chubbs, Steve 67, 76civil engineer. See Davis,
Arthur Powellcivil engineering 11cofferdams 47, 66, 70–73, 75
completion of 72–73dam removal and 93earth/rock used in 72
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113Index
upper/lower cofferdams 72
Colorado Basin 31dam’s benefits for 34Upper and Lower Basins
of 41, 48Colorado River 20, 22–24, 35,
96, 97Black Canyon and 9, 54canal building and 23diversion of 66–68early studies of 28, 29hydrological/geological
report on 31tributaries of 20
Colorado River Commission 40–41, 45
Colorado River Compact 40–42, 48
Colored Citizens Labor and Protective Association 63
combined dams 19–20concrete 16, 18, 70, 76
for Big Dig 47downstream face of dam
and 64hardening of 75–76of Hoover Dam 9, 43,
73–76last bucket poured and 76pouring process for 75roller-compacted 21See also cement
CongressColorado Basin study
and 31Hoover Power Plant Act
and 81House Resolution 140 of
48–49Reclamation Act and 26
construction materials 47. See also cement; concrete
construction timeline 33construction workers 51–65
African Americans as 63, 64
in Boulder City 60–63equipment innovations
and 54–56improved conditions of 59job conditions and 56–58mysterious illness of 69Ragtown and 52, 53, 54workers’ strike of 58–59
Coolidge, Calvin 39, 41, 42Coombe Dam (California) 56Corps of Engineers 32, 52Cowan, Oliver 74Crowe, Frank (“Hurry-Up”
Crowe) 54–56dam bid by 50innovations of 67, 70,
75, 83in labor dispute 59
Curitiba, Brazil 89curved gravity dams 16
ddam failures/disasters 91–94dam modernization 15–16dam removal 91dam types 17–20dangerous working conditions
58, 80Davis, Arthur Powell 30, 34
Boulder Dam and 32, 34dream for Colorado Basin
and 9, 27–29, 31–32, 37education of 28, 30reclamation services and
25, 30, 33
THE HOOVER DAM114
Davis, W.A. 43, 52Davis Dam 94de Berry, Don Pedro Bernardo
Villa 16de Sazilly, J. Augustin
Torente 18Deadwood Dam (Idaho) 56deaths of workers 57, 73, 74debate on dams 86–87dedication of Hoover Dam
84–85demolition of dams 91dimensions of Hoover Dam 43displacement of people, dams
and 87, 89, 95diversion tunnels 33, 47, 58,
66–68, 69, 70, 83Doak, William 59domestic water supply 36drawbacks of dams 88–89“drilling jumbos” 67Dunar, Andrew J. 31, 38, 58, 59,
60, 67, 76dynamite blasting 67, 73
Eearly dam- building manual 16earthquake, seismic evalua-
tions for 21Edwards Dam (Maine) 92–93Egyptian dams 11–12electric power. See
hydroelectric powerElephant Butte Dam (New
Mexico) 30Ely, Sims 62embankment dams 17–18,
92, 94Etowah River 53European dams and
modernization 15–16Explorer (steamboat) 23
FFagan, Louis 74Fall- Davis Report 31Federal Energy Regulatory
Commission 92First International Meeting of
People Affected by Dams 89fl ooding 23, 36
cofferdams and 71fl ood control and 24,
35, 88Fortune 31–32
GGarcés, Francisco 20Garrett, Elton 59generator, parts of 79Georgia Safe Dams Project 53Gieck, John 69Glasgow University 16Goodman, Frank 28Grand Canyon 20, 28, 84Grand Coulee Dam
(Washington) 18gravity dams 15, 16, 17, 18, 66Great Depression 7, 9, 45, 51,
58, 59, 60“Great Humanitarian, The” 40Green River 20, 28Guernsey Dam (Wyoming) 56
HHammurabi (King) 14hard hats, makeshift 80Harding, Warren G. 38, 40Hickory Log Creek 52–53high scalers 73–74highway project 96–97Hispanics 64History of Dams, A (Smith) 14Hittites, the 14Holmes, Helen and Neil 57–58
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115Index
Hoover, Herbert 38–40, 45as commerce secretary
39, 40, 48compact proclamation of
41, 42dam building and 39on dam naming 48gathering of states idea
of 40as “Great Humanitarian”
40, 49Hoover Bypass Project 96–97Hoover Dam: An American
Adventure (Stephens) 30Hoover Dam Bypass Bridge 81Hoover Power Plant Act 81“Human Pendulum, The” 74hydroelectric power 26, 36,
78–79generator weight and 43intake towers and 81–82natural fall of water and
78–79as renewable energy
87–88for revenue recovery
31, 80See also power plant
hydrographer 30hydrologist, defi nition of 35
IIckes, Harold 34, 45India 94Industrial Revolution 16infrastructure 66intake towers 81–82Interior Department 31
Interior Secretary of 26, 34, 43, 49
See also Bureau of Reclamation
irrigation 25–26farm irrigation 26, 35, 36water conservation and
35, 87Isthmian Canal
Commission 30Ives, Joseph C. 20, 23
JJohnson, Hiram 42
KKahn, Felix 50Kaiser, Harry 50Kaufman, Gordon B. 64–65Kurit Dam (Iran) 19
LLacey, Leonard P. 88Lake Mead 83–84, 95, 96Lake Mohave 95largest public works projects
46, 49Las Vegas, Nevada 38, 43,
52–53, 62, 63, 64, 96lining of tunnels 70Los Angeles Water and
Power 81Louis XIV (King) 16Lower Colorado Basin 41Lower Colorado River 94
MMacDonald & Kahn 50McBride, Dennis 31, 38, 58, 59,
60, 67, 76Mesopotamian dams 12, 13Mexican War 20Milles, Kevin 95Miss Vegas (boat) 88Mongolians 19Morrison, Harry 49
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THE HOOVER DAM116
Morrison- Knudsen 49, 50, 55–56
muckers/mucking out 68multiple- arch dams 19mysterious illness of
workers 69
Nnaming of Hoover Dam 34,
42–43displeasure with 45offi cial resolution of
48–49National Association for the
Advancement of Colored People (NAACP) 63
national resource protection 40Native Americans 64, 73Nero (Emperor) 15Neuse River 91Niagara Falls, New York
78, 79Nigeria 20North American Free Trade
Agreement 96–97
Ooldest known dam picture 15on- site rock quarry 21overfl ow. See spillwaysoverhead cable system 54,
75, 83
PPacifi c Bridge Company 50Panama Canal route 30Parker Dam 94Parks, Arnold 74penstocks 82, 83, 95Philadelphia, Pennsylvania 94Pickens, William 63
Powell, John Wesley 28–29Powell’s Irrigation Survey 30power plant 65, 79, 80, 81.
See also hydroelectric power
Prado Dam (California) 32, 33
public works projects 46, 49, 66
puddlers 75
QQuaker Neck Dam
(N. Carolina) 91
RRagtown 52, 53, 54, 59railroad lines 43Rankine, W.J.M. 16Reburg, Idaho 93Reclamation Act 26Reclamation Service. See U.S.
Bureau of Reclamationrecycling 21, 27renewable energy 87–88reservoirs 26, 83–84, 88river restoration 86rock piles (spoil) 68rockfi ll dam 32Rocky Mountains 23Romans 15, 19Roosevelt, Franklin D. 45,
84–85Roosevelt, Theodore 24Rutledge, Burl R. 74
SSadd- el- Kafara Dam (“Dam of
the Pagans”) 12, 15safety. See dangerous working
conditions
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117Index
Saint Ferréol Dam (France) 16Salton Sea 23Saluda Dam remediation
project 21San Juan River 30Santa Ana River project 32–33Sante Fe, New Mexico 41Schweinfurth, George 12Scotland 16Secretary of the Interior. See
under Interior Departmentsegregation 64Seven Oaks Dam 32–33Shea, Charlie 49–50Shoshone Dam (Wyoming) 30Sierra Club 86, 88Six Companies 49–50, 67, 76
as conglomerate 9, 47lawsuit against 69Miss Vegas boat and 88racial hiring issues and
63–64scrip money of 63strike against 58–59workers’ safety and 58,
69, 80Slenning, Lauri 95Smith, Alfred E. 39Smith, Norman 14Southern California Edison
36, 81Southern California, Imperial
Valley of 23–24Spain 16spillways 65, 76, 77, 78, 83Stephens, Joseph E. 30structural modifi cations to
dams 27Subiaco Dam (Italy) 15Sugar City, Idaho 93Swing, Phil 42
Swing- Johnson Bill 42Syria 18
Ttearing down dams 91Ted Williams Tunnel (Boston)
47temporary dams. See
cofferdamsTeton Dam (Idaho) 92, 93Three Gorges Dam (China) 95Tibi Dam (Spain) 15tourism 94, 95triangular- shaped dams. See
gravity damsTrue, Alan 65Truman, Harry S 49Turkey 14
UUnited States Committee on
Large Dams 86United States Society on
Dams 88Upper Colorado Basin 41U.S. Bureau of Reclamation
25–26, 27, 30, 33, 50, 41–42, 48
Colorado River Compact and 41–42
contracts expiration and 81
dam test program of 37Frank Crowe and 54, 55guided tour by 94Hoover Dam and 25modern dam operation by
26, 27, 94–97name change to 26See also reclamation
service
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THE HOOVER DAM118
U.S. Geological Survey 30, 31U.S. Reclamation Service
26, 30dam test program of 37Frank Crowe and 54, 55
U.S. Secretary of Labor 59U.S. Secretary of the Inte-
rior. See under Interior Department
Utah Construction 49, 55–56
VVaiont Dam (Italy) 91–92Virgin River 20, 84
Wwages for dam workers 63War Department 20Washington State 18water conservation 27, 35water demand 87
water rights. See Colorado River Compact
water storage 25–26, 96for lower Colorado
River 31for southern California
35–36Wilbur, Ray Lyman 43, 45workers. See construction
workersWorld Commission on Dams
89, 91World War I 38, 40world’s tallest dam, Hoover
Dam as 9–10
YYangtze River 95Yellowstone River 54Young, Walker “Brig” 31,
37–38, 60
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119
ABOUT THE AUTHORREBECCA ALDRIDGE has been a writer and editor for more
than 12 years. In addition to this title, she has written several
nonfi ction children’s books, including titles on Thomas Jefferson,
Italian immigrants in America, and the Titanic. As an editor, she
has had input on more than 50 children’s books covering such
diverse topics as breast cancer, vegetarianism, and tattooing and
body piercing. She lives in Minneapolis, Minnesota.
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